Proverbs 17:13-15 (KJV)
13 Whoso rewardeth evil for good, evil shall not depart from his house.
14 The beginning of strife is as when one letteth out water: therefore leave off contention, before it be meddled with.
15 He that justifieth the wicked, and he that condemneth the just, even they both are abomination to the LORD.