'Witness' in the Bible

“O Lord, though our many sins testify against us” [prays Jeremiah],“Act now [for us and] for Your name’s sake [so that the faithless may witness Your faithfulness]!For our backslidings are countless;We have sinned against You.

because they have acted foolishly in Israel and have committed adultery with their neighbors’ wives and in My Name have spoken false and concocted words, which I did not command them. I am He who knows and I am a witness,” says the Lord.’”

Then they said to Jeremiah, “May the Lord be a true and faithful witness against us if we fail to act in accordance with all the things that the Lord your God sends you to tell us.