'Witness' in the Bible

Then the king sent for Jehoiada, the chief priest, and said to him, Why have you not given the Levites orders that the tax fixed by Moses, the servant of the Lord, and by the meeting of Israel, for the Tent of witness, is to be got in from Judah and Jerusalem and handed over?

And the Lord sent them prophets to make them come back to him; and they gave witness against them, but they would not give ear.