Genesis 31:42, 53

In fact, if the God of my father had not been on my side—the God of Abraham and the fearsome God of Isaac—you would have sent me away empty-handed. But God has seen your abuse and my hard work. That is why he appeared to you last night and rebuked you!”

I call on the God of our ancestors—the God of your grandfather Abraham and the God of my grandfather Nahor—to serve as a judge between us.” So Jacob took an oath before the fearsome God of his father, Isaac, to respect the boundary line.