Proverbs 25:21-22

25:21 If your enemy is hungry, give him food to eat,

and if he is thirsty, give him water to drink,

25:22 for you will heap coals of fire on his head,

and the Lord will reward you.

Matthew 5:44

5:44 But I say to you, love your enemy and pray for those who persecute you,

Romans 12:20-21

12:20 Rather, if your enemy is hungry, feed him; if he is thirsty, give him a drink; for in doing this you will be heaping burning coals on his head. 12:21 Do not be overcome by evil, but overcome evil with good.