Midrasch zu Bereschit 9:12

When Pharaoh shall speak unto you, saying: “Show a wonder for you” (Exod. 7:9). He will be making a reasonable request to you. You find in the case of Noah, that though He said to him, after He saved him from the flood, Neither shall there be anymore a flood (Gen. 9:11), Noah demanded a sign, and God assured him: I have set my bow in the cloud (ibid., v. 13). Similarly, when Hezekiah was sick, the Holy One, blessed be He, sent Isaiah to him and he said: Thus saith the Lord, the God of David, thy father: “I have heard thy prayer, I have seen thy tears; behold, I will heal thee; on the third day thou shalt go up unto the house of the Lord” (II Kings 20:5). But he replied: What shall be the sign? (ibid., v. 8), and He answered: This shall be the sign unto thee from the Lord, that the Lord will do the thing that He hath spoken: shall the shadow go forward ten degrees, or go back ten degrees? (ibid., v. 9). Likewise, Joshua, the high priest, was told: Hear now, O Joshua the high priest, … for they are men that are a sign (Zech. 3:8). Since the righteous demanded signs, how much more did the wicked Pharaoh (have the right to do so). Hence, when Pharaoh says unto you: Show a wonder for you (he will be making a reasonable request).

"God further said, “This is the sign that I set for the covenant between Me and you, and every living creature with you, for all ages to come (Genesis 9:12)": Rabbi Yudan said "for generations" is written, he specifies two generations, the generation of Hezekiah and the generation of the men of the Great Assembly". Rabbi Hezekiah took out the generation of the men of the Great Assembly and introduced the generation of Rabbi Shimon son of Yochai. Elijah, remembered for good, and Rabbi Joshua son of Levi were reclining and studying together and they arrived at an opinion from Shimon son of Yochai and they said: "Look the author of this opinion is here and we will ask him about it". Elijah, remembered for good, went with him, and Shimon said to Elijah: "Who was with you?". And he said: "The great one of this generation, Rabbi Joshua son of Levi". He said to him: "Did a rainbow appear in his days?" And he said to him: "Yes". He said: "If a rainbow has appeared in his days he is not sufficient to meet with my face". Rabbi Hezekiah in the name of Rabbi Jeremiah said: "So spoke Rabbi Shimon son of Yochai: "Valley, valley be filled with dinars of gold" and it was filled". Rabbi Hezekiah in the name of Rabbi Jeremiah said: "So spoke Rabbi Shimon son of Yochai: "If Abraham can intercede from his generation to my generation, and I can intercede from my generation to the King Messiah. And if not, let Ahijah the Silonite join with me and we will intercede from Abraham to the King Messiah"". Rabbi Hezekiah in the name of Rabbi Jeremiah said: "So spoke Rabbi Shimon son of Yochai: "The world is not able to stand except by thirty men righteous like Abraham our father. If thirty, I and my son are two from them. If twenty, I and my son are two from them. If ten, I and my son are two from them. If five, I and my son are two from them. If two, I and my son are they. If one, I am he"".

"from a distant (rechokah) way": There is a (diacritical) dot above the heh in "rechokah" (to indicate that he observes Pesach Sheni) even if he were on a non-distant way and did not observe (the first) Pesach with them. Similarly, (Bereshit 16;5) "May the L-rd judge between me (Sarah) and between you (Abraham) (uvenecha)": There is a dot above (the yod in) "uvenecha" — She spoke of Hagar alone. Others say: (She spoke of Hagar) who engendered strife between him and her. Similarly, (Ibid. 18:9) "And they said to him (eilav): Where is Sarah, your wife?" There are dots above the aleph, yod and vav (in "eilav") — They knew where she was. Similarly (Ibid. 19:33) "and he did not know in her lying and in her rising (uvekumah)." There is a dot above (the vav in) "uvekumah" — He did not know in her lying and in her rising, but he knew in her rising. Similarly, (Ibid. 33:4) "And he (Esav) kissed (vayishakehu) him (Jacob)": There are dots above (all the letters in) "vayishakehu" — He did not kiss him with all his heart. R. Shimon b. Yochai says: It is a known halachah that Esav hates Jacob, but his mercy gained the ascendancy at that time and he kissed him with all his heart. (Ibid. 37:12) "And his brothers went to graze eth their father's flock in Shchem": There are dots above "eth" — They went only to graze themselves. Similarly, (Bamidbar 21:30) "We have laid it waste until Nofach which (asher) reaches unto Medva": There is a dot (above the resh in "asher") — They did so beyond that (Nofach) too, but here they destroyed the cities, too, whereas beyond that they destroyed only the people. Similarly, (Ibid. 3:39) "All the numbered of the Levites, whom Moses and Aaron numbered": There are dots above "Aaron" — Aaron was not of the numbered (of the Levites). Similarly, (Ibid. 3:29) "And issaron, issaron, for the one lamb,": There is a dot above the second vav in "And issaron" — There was one issaron alone. Similarly, (Devarim 29:28) "The hidden things are for the L-rd our G-d and the revealed ones are for us and our children (lanu ulevanenu) forever.": There are dots (above "lanu ulevanenu.") He said to them: If you have done (i.e., violated) what is revealed, I (the L-rd), likewise, will apprise you of what is concealed. Here, too, (in our instance,) there is a dot (above the heh in "rechokah" to indicate that he observes Pesach Sheni) even if he were on a non-distant way and did not observe (the first) Pesach with them. (Ibid. 10) "or to your generations": This provision (of Pesach Sheni) obtains for all of the generations. (Ibid. 11) "In the second month, on the fourteenth day, towards evening shall they offer it": These are the mitzvoth (directly) pertaining to its body, viz. (Shemot 12:5) "an unblemished lamb, a male, of the first year." "with matzoh and bitter herbs shall they eat it": These are mitzvoth attendant upon its body. (Devarim, Ibid. 12) "They shall not leave over of it until the morning, and a bone shall they not break in it": Scripture hereby superadds two mitzvoth concerning its body. This tells me only of these (as obtaining on Pesach Sheni). Whence do I derive (the same for) the other mitzvoth pertaining to its body? From (Ibid.) "According to all the statue of the Pesach shall they offer it." — But perhaps this would also include (the eating of) matzoth for seven days and the burning of chametz! It is, therefore, written "and a bone shall they not break in it." "a bone, etc." was included in the general category (viz. "According to all the statute of the Pesach"), and it departed from the category (for special mention) — to teach about the category, viz. Just as "a bone, etc." is a mitzvah (directly) pertaining to its body, so, "according to all the statute of the Pesach" speaks of mitzvoth (directly) pertaining to its body, (and not of the others). Issi b. Akavya says: "shall they offer it": Scripture speaks of mitzvoth pertaining to its body.