John Gill, on Gen 17:4

“And God said to him: I AM, and my covenant is with thee, and thou shalt be a father of many nations.”

“As for me, behold, my covenant is with thee,.... Who was gracious to make it, faithful to keep it, and immutable in it, though Abram was but a man, and sinful: and thou shalt be a father of many nations: as he was of many Arabian nations, and of the Turks in the line of Ishmael; and of the Midianites, and others, in the line of his sons by Keturah; and of the Israelites in the line of Isaac, as well as of the Edomites in the line of Esau; and in a spiritual sense the father of all that believe, in all the nations of the world, circumcised or uncircumcised, as the apostle explains it, Rom 4:11.”

Imported from an open dataset — not yet checked against the printed edition.