Romans 12:19-20

19Beloved, never avenge yourselves, but leave the way open for God’s wrath [and His judicial righteousness]; for it is written [in Scripture], “Vengeance is Mine, I will repay,” says the Lord.

20“But if your enemy is hungry, feed him; if he is thirsty, give him a drink; for by doing this you will heap burning coals on his head.”