Genesis 31:49-53

and Mizpah, for he said, “May the Lord keep watch between you and me when we are absent one from the other.

If you mistreat my daughters, or if you take wives besides my daughters, although no one is with us, see, God is witness between you and me.”

Laban also said to Jacob, “Behold this heap and behold the memorial stone which I have set between you and me.

This heap is a witness, and the memorial stone is a witness, that I will not pass by this heap to you for harm, and you will not pass by this heap and this memorial stone to me, for harm.

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.