Midrash su Genesi 21:10

And these are the names of the Sons of Israel that came into Egypt with Yaakov, every man came with his household – There it is written (Mishlei 13, 24): “He who spares the rod hates his son; but he who loves him disciplines him in his youth.” Ordinarily in the world, if a person says to his friend: “So-and-so hit your son”, he would be ready to reduce his livelihood. And why is it taught “ He who spares the rod hates his son”?! In order to teach you, that anyone who refrains from disciplining his son in the end causes him to fall into evil ways and will hate him. This is what we have found with Yishmael, who behaved wickedly on Avraham his father but did not rebuke him, with the result that he fell into evil ways and he hated him and he left from his house with nothing. What did Yishmael do when he was fifteen years old? He started to bring idols from the market and he would play with them and worship them as he had seen others do, immediately (Bereishit 21, 9) “And Sarah saw the son of the Egyptian Hagar that she had given birth for Avraham was fooling around etc…” And there is no fooling except for idol worship, like that it says (Shemot 32,6): And they rose up to fool around. Immediately (Bereishit 21,10): And she said to Avraham , Send out this maid-servant and her son, perhaps my son will learn from him. Immediately, (Bereishit 21,11) And this thing was very bad in the eyes of Avraham etc...on account of his son because he had become evil. (Bereshit 21,12) And G-d said to Avraham, do not let it be evil in your eyes etc... From here you can learn, that Avraham was secondary to Sarah in prophecy, following on, (Bereishit 21,14): And Avraham got up in the morning and he took bread and a bottle of water, to teach you, that he hated Yishmael because of his evil ways, and sent him and his mother Hagar empty-handed and expelled them from his house because of this. Do you really think that Avraham, of whom it is written (Bereishit 13,2): And Avraham was very rich in cattle etc... that he would send his wife and his son from his house empty-handed, without clothes or means of a livelihood?! Rather, this is to teach you, since he turned evil, he stopped thinking about him. What was his end? After he had been expelled, he sat at the cross-roads and was a bandit, as it says (Bereishit 16,12): And he was a wild man. And similar to this (Bereishit 25,28): And Yitzchak loved Esav, therefore he turned to evil ways, because he was not rebuked, like we were taught: Five transgressions the evil Esav transgressed on that day: He seduced an engaged lady, and killed a man, denied resurrection, and rejected the fundamentals of religion and spurned his birthright, that he desired the death of his father, and sought to kill his brother, as it says (Bereishit 27,41):May the days of mourning for my father be brought close etc.. And he forced Ya'acov to flee from his father. And he even went with Yishmael, to learn from his evil ways and to add to his wives, as it says (Bereshit 28,9): And Esav went to Yishmael. Similarly with David, that he did not rebuke or chastise his son Avshalom, he turned to evil ways and sought to kill his father, and he lay with concubines, and becoming the cause if his wandering, bare-footed and crying, and many thousands and myriads of Israelites were slaughtered, and he caused much suffering upon them which did not end. As it is written (Psalms 3,1): A song of David, when he fled from Avshalom his son, just as it was written after (Psalms 3,2) How great in number have my enemies become etc. And cultural evil is harsher on one's home than the war of Gog and Magog, for regarding the war of Gog and Magog it says: (Tehilim 2:1) "Why do the nations stir?" and later it is written: (Tehilim 3:2) "God, how many my enemies are!" And similarly David behaved with Adoniyah, he did not beat him in punishment, and did not get angry at him, and therefore he left to cultural evil, as is written: (Kings 1 1:6) "And his father never scolded him...and she bore him after Avshalom." Wasn't Avshalom the son of Maacha, while Adoniyahu was the son of Chagit? What does it mean, "she bore him after Avshalom"? Instead- since he [Avshalom] left to cultural evil, and his father never beat him, and it is written about Adoniyahu "his father never scolded him," he too left to cultural evil, and therefore it is written: "and she bore him after Avshalom." (Proverbs 13:24) "But he who loves him disciplines him in his youth" refers to the Holy Blessed One, who loves Israel, as it is written (Malachi 1:2) "I have loved you, says God," who increases their suffering. One can find three good gifts that the Holy Blessed One gave to Israel, and they were each given only by means of suffering: the Torah, the Land of Israel, and life in the World to Come. The Torah, as it is written: (Psalms 94:12) "How lucky is the man who You discipline, God, and to whom You teach Your Torah." The Land of Israel, as it is written: (Deuteronomy 8:5) "Bear in mind that the LORD your God disciplines you just as a man disciplines his son." What is written next? (Deuteronomy 8:7) "For the LORD your God is bringing you into a good land..." The World to Come, as it is written: (Proverbs 6:23) "For the commandment is a lamp, the teaching is a light, and the way to life is the rebuke that disciplines." And when anyone rebukes his son, the son increases his love for his father, and he honors him, as it is said: (Proverbs 29:17) "Discipline your son and he will give you peace." And it says: (Proverbs 19:18) "Discipline your son while there is still hope." And he increases his love for him, as it says: "But he who loves him disciplines him early," meaning because he disciplines him early, therefore he loves him. You find that Abraham disciplined Isaac his son and taught him Torah and guided him in his ways, as is written about Avraham: (Genesis 26:5) "In return for Avraham's obedience to my voice" and it is written: (Genesis 25:19) "These are the descendants of Isaac, son of Abraham," which teaches you that he was similar to his father in all ways- in beauty, in wisdom, in wealth, and in good deeds. You should know that he [Isaac] was thirty-seven years old when his he was bound by his father, and it is written: (Genesis 24:1) "And Abraham was old, advanced in age" and yet he bound him and positioned him like a lamb, and he did not refuse. Therefore: (Genesis 25:5) "Abraham gave all that he had to Isaac," Which is to say, "he who loves him disciplines him early." In the same manner, Isaac would discipline Jacob early, for Isaac taught him Torah and disciplined him in his house of study, as it says: (Genesis 25:27) "but Jacob was a mild man who stayed home." And he learned what his father taught him, and then he separated from his father and hid in the house of Ever to study Torah. Therefore he merited blessing and inherited the land, as it says: (Genesis 27:1) "Jacob lived in the land of his father's residence, in the land of Canaan." And even our Patriarch Jacob disciplined his sons, and beat them and taught them his ways, so that none of them would be disposable, as it is written: (Exodus 1:1) "These are the names of the sons of Israel who arrived to Egypt..." The verse equates them all to Jacob, for they were all righteous as he had been. This resolves: "But he who loves him disciplines him early."

What had Ishmael done? When he was fifteen years old, he brought idols into his home, to play with and to worship as he had seen others do. As soon as Sarah saw the son of Hagar the Egyptian, whom she had borne unto Abraham, making sport (Gen. 21:9). The word sport refers only to practicing idolatry, as it is said: And the people sat down to eat and to drink, and rose up to make sport (Exod. 32:6). She said to him: Abraham, cast out this bondwoman and her son (Gen. 21:10), lest my son learn from his behavior.

And Abraham was old, and well stricken in years (Gen. 24:1). Scripture states elsewhere in reference to this verse: A virtuous woman is a crown to her husband (Prov. 12:4). This verse alludes to Abraham, who mourned for Sarah, for it was written previously: And Sarah died (Gen. 23:2). Abraham began to weep for her, saying: A woman of valor who can find? For her price is far above rubies. The heart of her husband doth safely trust in her (Prov. 31:10). When did he demonstrate his trust in her? When he said to her: Say, I pray thee, thou art my sister (Gen. 12:13). She doeth him good and not evil all the days of her life (Prov. 31:12). She seeketh between wool and flax (ibid., v. 13) alludes to her decision to separate Isaac and Ishmael when she said to her husband: Cast out this bondwoman and her son (Gen. 21:10). She is like the merchant ships (Prov. 31:14); For the woman was taken to Pharaoh’s house (Gen. 12:15), and later Abimelech sent her away. She riseth also while it is yet night (Prov. 31:15). When did that happen? At the time Abraham arose early in the morning (Gen. 22:3). She considereth a field and buyeth it (Prov. 31:16). She thought about the field of Machpelah and acquired it. Ultimately she was buried there, as it is said: And after this, Abraham buried Sarah, his wife (Gen. 23:19). She girdeth her loins with strength (for the birth of Isaac) (Prov. 31:17). When was that? When the angels appeared, as it is said: And Abraham went into the tent unto Sarah (Gen. 18:6).

The Lord saw that Leah was hated (Gen. 29:17). Scripture states elsewhere in allusion to this verse: For He knoweth base men; and when He seeketh iniquity, will He not then consider it? (Job 11:11). This verse refers to what happened to Ishmael at the time that Sarah told Abraham: Cast out this bondwoman and her son (Gen. 21:10). This entire matter is described in the verse And Abraham rose up early in the morning and took bread and a bottle of water, and gave it to her, etc. (ibid., v. 14).

THE TRIALS OF ABRAHAM (continued)
THE ninth trial (was as follows): Ishmael was born with (the prophecy of the) bow, and he grew up with the bow, as it is said, "And God was with the lad, and he grew … and he became an archer" (Gen. 21:20). He took bow and arrows and began to shoot at the birds. He saw Isaac sitting by himself, and he shot an arrow at him to slay him. Sarah saw (this), and told Abraham. She said to him: Thus and thus has Ishmael done to Isaac, but (now) arise and write (a will in favour) of Isaac, (giving him) all that the Holy One has sworn to give || to thee and to thy seed. The son of this handmaid shall not inherit with my son, with Isaac, as it is said, "And she said unto Abraham, Cast out this bondwoman and her son" (Gen. 21:10).

Ben Tema said: Sarah said to Abraham, Write a bill of divorce, and send away this handmaid and her son from me and from Isaac my son, in this world and from the world to come. More than all the misfortunes which overtook Abraham, this matter was exceedingly evil in his eyes, as it is said, "And the thing was very grievous in Abraham's sight on account of his son" (Gen. 21:11).

AND SARAH SAW THE SON OF HAGAR THE EGYPTIAN etc - Rabbi Shimeon bar Yohai said: Rabbi Akiva used to interpret this to his [Ishmael’s] shame, Rabbi Akiba lectured: AND SARAH SAW [THE SON OF HAGAR THE EGYPTIAN, WHOM SHE HAD BORNE TO AVRAHAM, MAKING SPORT.] Now 'making sport' refers to nothing else but sexual immorality, as in the verse, "The Hebrew servant, whom you have brought to us, came in to make sport of me. (Gen. 39:17). This teaches that Sarah saw Ishmael ravish maidens, seduced married women and dishonored them. R. Ishmael taught: This term 'making sport' refers to idolatry, as in the verse, "And the people sat to eat and drink and got up to make sport' (Exodus 32:6). This teaches that Sarah saw Ishmael build altars, catch locusts, and sacrifice them. R. Eleazar said: The term 'making sport' refers to bloodshed, as in the verse, "Let the young men, please, arise and make sport before us" (II Sam. 2:14) Rabbi Azariah said in Rabbi Levi’s name: Ishmael said to Isaac: 'Let us go and see our pieces in the field' and he would pick up the bow and shoot arrows, aiming in Itzchak's direction, while pretending to be playing (making sport), as it is written: "as a madman who casts fire-brands, arrows, and death; so is the man that deceives his neighbor, and said: 'I am just joking (making sport)'. And I [Rabbi Shimon bar Yochai] say that this is to be interpreted to the praise [of Ishmael]. This expression of making sport is only used as 'inheritance'. In the moment that Itzchak our father was born all were happy. Ishmael said to them: are you dumb? I am the first-born, I am going to receive double portion [of the inheritance], that from the answer of Sarah our mother to Avraham 'because the son of this maidservant will not inherit with my son, with Itzchak' you learn that he would not inherit 'with my son' - even if he wasn't Itzchak - and 'with Itzchak' - even if he wasn't my son. All the more so [this is true] 'with my son, with Itzchak'.