Genesis 31:50-52

50If you mistreat my daughters or take other wives, although no one is with us, remember that God is a witness between you and me.”

51Laban also said to Jacob, “Here is the mound, and here is the pillar I have set up between you and me. 52This mound is a witness, and this pillar is a witness, that I will not go past this mound to harm you, and you will not go past this mound and pillar to harm me.