Proverbs 25:21 in the World English Bible
If your enemy is hungry, give him food to eat. If he is thirsty, give him water to drink;
Context
20 As he that taketh away a garment in cold weather, and as vinegar upon nitre, so is he that singeth songs to an heavy heart.
21 If thine enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink:
22 For thou shalt heap coals of fire upon his head, and the LORD shall reward thee.