Midrash sobre Gênesis 17:19

Now these are the names (Exod. 1:1). The names of the Israelites were most appropriate for them. You find, in fact, that the Holy One, blessed be He, assigned their names to them. He gave Abraham a son, and He said to him: And thou shalt call his name Isaac (Gen. 17:19). The yod in his name equals ten, the tzaddi, ninety, the het, eight, and the kuf, one hundred, totaling two hundred and eight in all. But the Israelites were forced to remain in Egypt only two hundred and ten years⁸Two years were added because he had asked the baker to intervene in his behalf, thus indicating a lack of faith that God would deliver him. It took two years for the baker to do so. even though the Holy One, blessed be He, had told Abraham: And shall serve them; and they shall afflict them four hundred years (ibid. 15:13).

Another explanation of Thou art fairer than the children of men. This refers to Abraham, for the Holy One, blessed be He, did not speak to any generation prior to his, as it is stated: And God said unto Abraham (Gen. 17:19). Grace is poured upon thy lips is said because he pleaded in behalf of the Sodomites: That be far from Thee (halilah) to do after this manner (ibid. 18:25). Some say That be far from Thee would be a profanation of Thy name (halil shemkha) to do this, while others say it means to be set aside (halelah), as in the case of an unchaste woman who is set aside. R. Huna said: It would be a profanation of the name of God if He were to destroy the righteous with the wicked, for men would then say: He did this to the generation of Enoch (which suffered a flood), the generation of the flood,²⁶All were punished, righteous or not. (and) the generation of the dispersion²⁷Punishment for building the Tower of Babel, though all were not involved. (Gen. 11:1–9), for they refrained from repenting. Grace is poured upon thy lips implies that you should be convinced that it (the law) will go forth from your descendants, since I gave him the Torah and he will teach it to your descendants, as is said: He gave unto Moses.

Rabbi Jehudah said: In that night the Holy One, blessed be He, was revealed unto him. He said to him: Abraham ! Dost thou not know that Sarah was appointed to thee for a wife from her mother's womb? She is thy companion, and the wife of thy covenant; Sarah is not called thy handmaid, but thy wife; neither is Hagar called thy wife, but thy handmaid; and all that Sarah has spoken she has uttered truthfully. Let it not be grievous in thine eyes, as it is said, "And God said unto Abraham, Let it not be grievous in thy sight" (Gen. 21:12).

How do we know (this with reference to) Isaac? Because it is said, "And God said, Sarah thy wife shall bear thee a son indeed; and thou shalt call his name Isaac" (Gen. 17:19). Why was his name called Isaac? Because Yad (the first Hebrew letter of Isaac indicates) the ten trials wherewith our father Abraham was tried; and he withstood them all. Zaddi (the second letter indicates) the ninety (years), for his mother was ninety years (at the birth of Isaac), as it is said, "And shall Sarah, that is ninety years old, bear?" (Gen. 17:17). Cheth (the third letter points to) the eighth (day), for he was circumcised on the eighth day, as it is said, "And Abraham circumcised his son Isaac, being eight days old" (Gen. 21:4). Ḳuf (the fourth letter of the name marks) the hundred (years), for his father was an hundred years old (at Isaac's birth), as it is said, "And Abraham was an hundred years old" (Gen. 21:5).