Genesis 31:42, 53

If the God of my father, the God of Abraham, and the fear of Isaac, had not been for me, surely now you would have sent me away empty-handed. God has seen my affliction and the toil of my hands, so He rendered judgment last night.”

The God of Abraham and the God of Nahor, the God of their father, judge between us.” So Jacob swore by the fear of his father Isaac.