'Witness' in the Bible

but it will be a witness between us and you, and between our generations after us, that we may perform the service of Yahweh before him with our burnt offerings, with our sacrifices, and with our peace offerings;' that your children may not tell our children in time to come, 'You have no portion in Yahweh.'

"Therefore we said, 'It shall be, when they tell us or our generations this in time to come, that we shall say, "Behold the pattern of the altar of Yahweh, which our fathers made, not for burnt offering, nor for sacrifice; but it is a witness between us and you."'

The children of Reuben and the children of Gad named the altar "A Witness Between Us that Yahweh is God."

Joshua said to all the people, "Behold, this stone shall be a witness against us; for it has heard all the words of Yahweh which he spoke to us. It shall be therefore a witness against you, lest you deny your God."