Moses
Genesis 17:18BSB·traditional attribution

And Abraham said to God, “O that Ishmael might live under Your blessing!”

John Calvin Reformed @genevareformer

18. And Abraham said unto God Abraham does not now wonder silently within himself, but pours forth his wish and prayer. His language, however, is that of a mind still perturbed and vacillating, O that (or I wish that) Ishmael might live!

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. The promise made to Abraham of a son by Sarai, that son in whom the promise made to him should be fulfilled, that he should be the father of many nations; for she also shall be a mother of nations, and kings of people shall be of her, Gen 17:16. Note, 1. God reveals the purposes of his good-will to his people by degrees.

Commenting on Genesis 17:15-22

John Gill Reformed Baptist @doctorgill

And Abraham said unto God,.... Being told he should have a son by Sarah, that should be his heir, he is concerned for Ishmael what would become of him; and who, being grown up, had doubtless a large share in his affections, and it is highly probable he began to think he was the promised seed, since he had lived to such an age, and...