Genesis 21:30

And he said, That thou take the seven ewe-lambs of my hand, that they may be a witness to me that I have dug this well.

Genesis 31:52

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.

Genesis 31:44-48

And now, come, let us make a covenant, I and thou; and let it be a witness between me and thee.

but to be a witness between us and you, and between our generations after us, that we might do service to Jehovah before him with our burnt-offerings, and with our sacrifices, and with our peace-offerings; that your children may not say to our children in future, Ye have no portion in Jehovah.

Joshua 24:27

And Joshua said unto all the people, Behold, this stone shall be a witness unto us, for it hath heard all the words of Jehovah which he spoke unto us; and it shall be a witness against you, lest ye deny your God.