This 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.
KJV
This 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.
ASV
This heap be witness, and the 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.