ליטעראַטור פֿון בית שני אויף בראשית 17:16

In the first place, I do not despair, says he, O Lord, of a better generation, but I believe thy promise: nevertheless, it would be a sufficient blessing for me for this son to live who in the meantime is a living son, standing visibly, even though he be not so according to the legitimate blood, but is only born of a concubine. In the second place, that blessing which he is now asking for is an additional one; for he does not entreat for life alone for his sons, but for an especial life in God; and we must suppose that there is nothing more perfect than the rejoicing in the presence of God with a salutary soundness of mind, which is equal to immortality. In the third place, he by a conjecture intimates that the divine law, when heard, ought not to be considered enough if merely heard, but that it ought also to enter more deeply into the inward man, and to form his principal part; for that life is worthy of being beheld by the Deity which is formed in accordance with his word.

[130] We have now dealt sufficiently with the change and substitution of names and will proceed to the next points in our inquiry. What followed at once was the promise of the birth of Isaac. For after calling his mother Sarah instead of Sarai He says to Abraham, “I will give thee a child from her” (Gen. 17:16). Each part of this must be severally examined.