'Testify' in the Bible

‘If anyone sins after he hears a public adjuration (solemn command to testify) when he is a witness, whether he has seen or [otherwise] known [something]—if he fails to report it, then he will bear his guilt and be held responsible.

And it shall come about if you ever forget the Lord your God and follow other gods and serve them and worship them, I testify against you today that you will most certainly perish.

and they shall respond, and say, ‘Our hands did not shed this blood, nor did our eyes see it.

Here I am; testify against me before the Lord and [Saul] His anointed [if I have done someone wrong]. Whose ox have I taken, or whose donkey have I taken, or whom have I exploited? Whom have I oppressed or from whose hand have I taken a bribe to blind my eyes [to the truth]? [Tell me and] I will restore it to you.”

“Your own mouth condemns you, and not I;Yes, your own lips testify against you.

“You have taken a firm hold on me and have shriveled me up,It has become a witness [against me];And my leanness [and infirmity] rises up [as evidence] against me,It testifies to my face [about my guilt].

“Hear, O My people, and I will speak;O Israel, I will testify against you:I am God, your God.

“Listen carefully, I have appointed him [David, representing the Messiah] to be a witness to the nations [regarding salvation],A leader and commander to the peoples.

For our transgressions are multiplied before You [O Lord],And our sins testify against us;For our transgressions are with us,And we know and recognize our wickedness [our sin, our injustice, our wrongdoing]:

“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.

“O My people, what have I done to you [since you have turned away from Me]?And how have I wearied you? Answer Me.