Genesis 21:30

And he will say, For the seven ewe lambs thou shalt take from my hand, in order to be to me for a testimony that I dug this well.

Genesis 31:52

A witness this heap, and a witness the pillar, if I will not pass over this heap to thee, and thou shalt not pass over to me, this heap and this pillar for evil.

Genesis 31:44-48

Now come thou we will make a covenant, I and thou; and it was for witness between me and between thee.

But this a witness between us and between you, and between our generations after us, to serve the service of Jehovah before him with our burnt-offerings and with our sacrifices and with our peace-offerings; and your sons shall not say, To-morrow, to our sons, not to you, a part in Jehovah.

Joshua 24:27

And Joshua will say to all the people, Behold, this stone shall be to us for a testimony, for it heard all the sayings of Jehovah which he spake with us: and it was to you for a testimony lest ye shall lie to your God.