1 Samuel 24:7

So David stayed his servants with these words, literally, "rent to pieces, cut down," said of a solemn rebuke, and suffered them not to rise against Saul, for the purpose of taking bloody revenge upon the oppressor. But Saul rose up out of the cave and went on his way. David's act was one of true magnanimity. Christians should always remember to leave vengeance to God, for He will requite in an adequate and just manner.