Midrash su Genesi 49:26

R. Malai. in the name of R. Isaac, said further: "Since the day when Joseph departed from his brothers, he tasted no wine, as it is written (Gen. 47, 26.) And on the crown of the head of him who was separated from his brother." R. Jose b. Chanina said: "The brothers of Joseph also did not taste wine, for it is said (Ib. 43, 34.) And they drank and were merry with him. We infer that without him they did not drink." But the former (R. Malai) holds this refers to being drunk but not to tasting. R Malai further said: "As a reward [due to Aaron] for, And when he sees thee, he shall be glad in his heart (Ex. 4, 14) , he was given the Choshen Hamishpat on his heart."

Rabbi Elazar, son of 'Arakh, said to them: The Holy One, blessed be He, said this to Abraham only at the hour when he had seed, as it is said, "Thy seed shall be a stranger in a land that is not theirs" (ibid.). From the time when Isaac was born until Israel went forth from Egypt 400 years (elapsed). (Rabban Jochanan, son of Ẓakkai) said to him: Verily it is written, "Now the sojourning of the children of Israel, which they sojourned in Egypt, was four hundred and thirty years" (Ex. 12:40). He answered him, saying: 210 years Israel abode in Egypt, and five years before Jacob came to Egypt there were born unto Joseph(the fathers of) two tribes, Manasseh and Ephraim, and they belonged to the Israelites. Behold, (we have) 215 years of days and nights, (this equals) 430 years; for the Holy One, blessed be He, reduced the time for the sake of the merit of the Patriarchs, for they are the mountains of the world, and for the sake of the merit of the Mothers, for they are the hills of the world, and concerning them the Scripture says, "The voice of my beloved ! Behold, he cometh, leaping upon the mountains, skipping over the hills" (Cant. 2:8).