Midrash su Genesi 25:13

Another interpretation: R. Dostay³⁵Gk.: dositheos. said: If you take a wife who bears < a child > and dies, do not be idle in your old age without a wife. Why? (Eccl. 11:6:) BECAUSE YOU DO NOT KNOW WHICH WILL SUCCEED. From whom do you learn < this fact >? From Abraham, who in his youth only sired one < child > but in his old age sired twelve. R. Levi said: He is the one to whom the Holy One said: (in Gen. 12:3): AND IN YOU ALL THE FAMILIES OF THE EARTH SHALL BE BLESSED. Thus God arose in the generation of the dispersion and dispersed them into thirty families, as stated (in Gen. 11:8): SO THE LORD DISPERSED THEM…. R. Levi said: The Holy One said: I am producing them out of you. He is the one to whom the Holy One had said: AND IN YOU < ALL THE FAMILIES OF THE EARTH > SHALL BE BLESSED. So from him he produced thirty families; and they are the following: twelve princes which he produced from Ishmael (Gen. 25:13-16), the sixteen descendants of Keturah (Gen. 25:1-4), and (according to Gen. 25:23) TWO NATIONS ARE IN YOUR (Rebekah's) WOMB, for a total of thirty families. Ergo (in Gen. 25:1): THEN ABRAHAM TOOK ANOTHER WIFE.