'Bear Witness' in the Bible

But wherever they will not receive you or listen to you, when you leave shake off the very dust from under your feet to bear witness concerning them."

See to yourselves! They will betray you to courts of law; and you will be taken to Synagogues and beaten; and you will be brought up before governors and kings for my sake, that you may bear witness before them.

And the highest priest stood up amongst them all, and asked Jesus saying, "Answerest thou nothing? How is it that these bear witness against thee?"

And Pilate asked him again, saying, Answerest thou nothing? See of how many things they bear witness against thee.