Genesis 21:30

And he answered, "Seven lambs shalt thou take of my hand, that it may be a witness unto me, that I have digged this well."

Genesis 31:52

this heap be witness and also this mark, that I will not come over this heap to thee, and thou shalt not come over this heap and this mark, to do any harm.

Genesis 31:44-48

Now therefore, come on, let us make a bond, I and thou together, and let it be a witness between thee and me."

but it shall be a witness between us and you and our generations after us, that we should serve the LORD, with our offerings, sacrifices and peace offerings: and that your children should not say to ours in time to come: ye have no part in the LORD.'

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 the LORD which he spake with us. It shall be therefore a witness unto you, lest ye lie unto your God."