Genesis 31:50-52

50If thou shalt afflict my daughters, or if thou shalt take other wives beside my daughters, no man is with us; see, God is witness betwixt me and thee.

51And Laban said to Jacob, Behold this heap, and behold this pillar, which I have cast betwixt me and thee;

52This heap be witness, and this pillar be witness, that I will not pass over this heap to thee, and that thou shalt not pass over this heap and this pillar unto me, for harm.