'Witness' in the Bible

He said, "You shall take these seven ewe lambs from my hand, that it may be a witness to me, that I have dug this well."

Now come, let us make a covenant, you and I; and let it be for a witness between me and you."

Laban said, "This heap is witness between me and you this day." Therefore it was named Galeed

If you afflict my daughters, or if you take wives besides my daughters, no man is with us; behold, God is witness between me and you."

May this heap be a witness, and the pillar be a witness, that I will not pass over this heap to you, and that you will not pass over this heap and this pillar to me, for harm.