Moses
Genesis 26:5BSB·traditional attribution

because Abraham listened to My voice and kept My charge, My commandments, My statutes, and My laws.”

John Calvin Reformed @genevareformer

5. Because that Abraham obeyed my voice. Moses does not mean that Abraham’s obedience was the reason why the promise of God was confirmed and ratified to him; but from what has been said before, (Genesis 22:18,) where we have a similar expression, we learn, that what God freely bestows upon the faithful is sometimes, beyond their desert, ascribed to themselves; that they, knowing their...

Matthew Henry Presbyterian @wholebiblehenry

Here, I. God tried Isaac by his providence. Isaac had been trained up in a believing dependence upon the divine grant of the land of Canaan to him and his heirs; yet now there is a famine in the land, Gen 26:1. What shall he think of the promise when the promised land will not find him bread?

Commenting on Genesis 26:1-5

John Gill Reformed Baptist @doctorgill

Because that Abraham obeyed my voice,.... In all things, and particularly in offering up his son at his command: and kept my charge; whatever was given him in charge to observe; this, as Aben Ezra thinks, is the general, of which the particulars follow: my commandments, my statutes, and my laws; whether moral, ceremonial, or civil and judicial; all and everyone which God enjoined him, he was careful to observe.