Moses
Genesis 21:23KJV·traditional attribution

Now therefore swear unto me here by God that thou wilt not deal falsely with me, nor with my son, nor with my son’s son: but according to the kindness that I have done unto thee, thou shalt do unto me, and to the land wherein thou hast sojourned.

John Calvin Reformed

23. That thou wilt not deal falsely with me “Si mentitus fueris mihi.” — “If thou shalt have lied unto me.” In the margin Calvin gives, “Si fefelleris, aut infideliter egeris.” — “If thou shalt have deceived, or have acted unfaithfully.” See margin of English version.

Matthew Henry Presbyterian

We have here an account of the treaty between Abimelech and Abraham, in which appears the accomplishment of that promise (Gen 12:2) that God would make his name great. His friendship is valued, is courted, though a stranger, though a tenant at will to the Canaanites and Perizzites. I. The league is proposed by Abimelech, and Phichol his prime-minister of state and general of his army. 1.

Commenting on Genesis 21:22-32

John Gill Reformed Baptist

And Abraham said, I will swear. Sensible of the many favours he had received from Abimelech in times past, and was still indulged with, he very readily agreed to his proposal; and the rather, as he knew by the vision between the pieces, that it would be four hundred years before his posterity should be put into the possession of the land of Canaan; and...