Genesis 21:30

And he saith, 'For -- the seven lambs thou dost accept from my hand, so that it becometh a witness for me that I have digged this well;'

Genesis 31:52

this heap is witness, and the standing pillar is witness, that I do not pass over this heap unto thee, and that thou dost not pass over this heap and this standing pillar unto me -- for evil;

Genesis 31:44-48

and now, come, let us make a covenant, I and thou, and it hath been for a witness between me and thee.'

but a witness it is between us and you, and between our generations after us, to do the service of Jehovah before Him with our burnt-offerings, and with our sacrifices, and with our peace-offerings, and your sons do not say hereafter to our sons, Ye have no portion in Jehovah.

Joshua 24:27

And Joshua saith unto all the people, 'Lo, this stone is against us for a witness, for it hath heard all the sayings of Jehovah which He hath spoken with us, and it hath been against you for a witness, lest ye lie against your God.'