'Avenge' in the Bible

And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary.

Yet because this widow troubleth me, I will avenge her, lest by her continual coming she weary me.

And shall not God avenge his own elect, which cry day and night unto him, though he bear long with them?

I tell you that he will avenge them speedily. Nevertheless when the Son of man cometh, shall he find faith on the earth?