'Witness' in the Bible

Here I am. Witness against me before Yahweh, and before his anointed. Whose ox have I taken? Whose donkey have I taken? Whom have I defrauded? Whom have I oppressed? Of whose hand have I taken a ransom to blind my eyes therewith? I will restore it to you."

He said to them, "Yahweh is witness against you, and his anointed is witness this day, that you have not found anything in my hand." They said, "He is witness."

Jonathan said to David, "Yahweh, the God of Israel, [be witness]: when I have sounded my father about this time tomorrow, [or] the third day, behold, if there be good toward David, shall I not then send to you, and disclose it to you?