Romans 12:20 in the King James Version
Therefore if thine enemy hunger, feed him; if he thirst, give him drink: for in so doing thou shalt heap coals of fire on his head.
Context
19 Don’t seek revenge yourselves, beloved, but give place to God’s wrath. For it is written, “Vengeance belongs to me; I will repay, says the Lord.”
20 Therefore “If your enemy is hungry, feed him. If he is thirsty, give him a drink; for in doing so, you will heap coals of fire on his head.”
21 Don’t be overcome by evil, but overcome evil with good.