2 Bible Verses about Double Penalty

Pay her back the treatment with which she has treated you; yes, repay twice over what her actions deserve; in the cup which she mixed for you, mix for her as much again;

Alas for you, teachers of the law and Pharisees, hypocrites that you are! You scour land and sea to make a single convert, and, when he is gained, you make him twice as deserving of the Pit as you are yourselves.