'Witness' in the Bible

Here I am: witness against me before Jehovah, and before his anointed: whose ox have I taken? or whose ass have I taken? or whom have I defrauded? whom have I oppressed? or of whose hand have I taken a ransom to blind mine eyes therewith? and I will restore it you.

And he said unto them, Jehovah is witness against you, and his anointed is witness this day, that ye have not found aught in my hand. And they said, He is witness.

And Jonathan said unto David, Jehovah, the God of Israel, be witness : when I have sounded my father about this time to-morrow, or the third day, behold, if there be good toward David, shall I not then send unto thee, and disclose it unto thee?