Genesis 31:50-52

50if thou shouldest afflict my daughters, or if thou shouldest take wives besides my daughters, — no man is with us; see, 1God is witness between me and thee!

51And Laban said to Jacob, Behold this heap, and behold the pillar which I have set up between me and thee:

52[let] this heap be witness, and the pillar a witness, that neither I pass this heap [to go] to thee, nor thou pass this heap and this pillar [to come] to me, for harm.