מדרש אויף בראשית 4:2

Pesachim (Fol. 3) R. Joshua b. Levi said: "A man should never bring forth from his mouth an unfit word, for the Scripture uses a circumlocution of eight [extra] letters in order to avoid an ugly word; for it is said (Gen. 4, 2) Of the clean beasts and of the beasts that are not clean." R. Papa said: "A circumlocution of nine letters is found in the Scripture; for it is said (Deu. 23, 11) If there be among thee, any man that is not clean." Rabina said: "Ten letters [is the circumlocution]; for in the same text there is also an extra letter, Vav." R. Acha b. Jacob said: "Sixteen extra letters are used [in order to avoid an unfit word], as it is said (I Sam. 20, 26) For he thought something hath befallen him, he is not clean, because he has not yet purified himself [in order to avoid the word impure]." At the academy of R. Ishmael, it was taught that a man should always speak in clean language, since the seat of a male zab the passage calls (Lev. 15, 9) saddle, and the seat of a female zab the passage calls (Ib.) sitting place. This principle is also supported by the following passage (Job 15, 5 ) So that thou choosest the language of the prudent. Also by another passage (Ib. 33, 3) And my lips utter knowledge clearly. Why does he cite all these passages [is not the first one sufficient]? You will perhaps say that this applies only to Biblical matters, but for Rabbinical matters any language might be used. Come, listen; it is said, So that thou choosest a language of the prudent. And if you will say that this applies only to Rabbinical matters, but for secular affairs, any language might be used. Come, Listen to this passage; And my lips utter knowledge clearly.

“Was [haya] [a Judean man in the Shushan citadel]….” Rabbi Yoḥanan said: Everyone about whom “haya” is stated, it is he at the beginning and it is he at the end.⁹ He was righteous from beginning to end. They objected to him; but isn’t it written: “One was [haya] Abraham” (Ezekiel 33:24)?¹⁰ Abraham began his life as an idolater; he wasn’t the same at the beginning and the end. He said to them: That is not, in fact, a refutation, as Rabbi Ḥanina and Rabbi Yoḥanan said: At age three Abraham identified his Creator. That is what is written: “Because [ekev] Abraham heeded My voice” (Genesis 26:5). The number of years that Abraham heeded the voice of his Creator is the equivalent of ekev (172),¹¹Ayin – 70, kof –100, beit – 2 and he lived one hundred and seventy-five years. [If one does not accept this explanation,] how do I find expression for haya about him? It means that he was fated from the beginning to guide the entire world to repent.¹²Although Abraham was not a believer in God his whole life, he had the potential from the beginning.
“[The Lord God said:] Behold, the man has become [haya] [like one of us, knowing good and evil]” (Genesis 3:22) – he became fated to die. “The serpent was [haya] more cunning” (Genesis 3:1) – he was fated for punishment. “Cain was [haya] a cultivator of the ground” (Genesis 4:2) – he was fated for exile, as you say: “Cain departed from the presence of the Lord” (Genesis 4:16); saying that he would be “restless and wandering” (Genesis 4:12). “There was [haya] a man in the land of Utz” (Job 1:1) – he was fated for suffering. “Noah, a righteous man, was [haya] faultless” (Genesis 6:9) – he was fated to acknowledge his Creator. “Moses was [haya] herding (Exodus 3:1) – he was fated for salvation. Mordekhai was fated for redemption.
Rabbi Levi and the Rabbis: Rabbi Levi said: Anyone about whom haya is stated witnessed a new world. Rabbi Shmuel bar Naḥman said: They are five.
Noah – yesterday “Water eroded stone” (Job 14:19), as Rabbi Levi said in the name of Rabbi Yoḥanan: Even millstones were dissolved during the flood, and now [after the flood] it says: “The sons of Noah who emerged from the ark…” (Genesis 9:18),¹³Immediately following this verse, the Torah relates how the earth was repopulated by Noah’s sons while Noah was alive. indicating that he witnessed a new world.
Joseph – yesterday “they tortured [his feet] with chains” (Psalms 105:18), and now “And Joseph was [haya] was the ruler over the land” (Genesis 42:6); that is, he witnessed a new world.
Moses – yesterday he was fleeing from Pharaoh and now he is drowning him in the sea; that is, he witnessed a new world.
Job – yesterday “He spills my bile onto the ground” (Job 16:13), and now “and the Lord gave Job double what he had had” (Job 42:10); that is, he witnessed a new world.
Mordekhai – yesterday “he wore sackcloth and ashes” (Esther 4:1), and now “he emerged from before the king in royal garments” (Esther 8:15).
“And his name was Mordekhai” (Esther 2:5). Just as myrrh [mor] is first of all the spices,¹⁴It is first on the list of ingredients of the sacred oil of anointment (Exodus 30:23). so was Mordekhai first among the righteous in his generation.

And Cain brought from the fruit of the ground and Abel brought from the fat firstlings of his ‎sheep. And the Lord turned and had respect unto Abel and to his offering and fire came down from ‎heaven and consumed it.‎ And unto Cain and to his offering the Lord did not incline and had no respect; for he offered ‎unto the Lord from the very worst of the fruits of the ground.‎ And Cain became jealous of his brother Abel on that account and desired to find some pretext ‎to kill him.‎ And it came to pass some time after this, that Cain and his brother Abel went out into the field ‎to do their work.‎And they were both in the field, Cain tilling and plowing his land, and Abel watching his sheep.‎