21 If your enemy is hungry, give him food to eat.
If he is thirsty, give him water to drink:

Matthew Henry's Commentary on Proverbs 25:21

Commentary on Proverbs 25:21-22

(Read Proverbs 25:21-22)

The precept to love even our enemies is an Old Testament commandment. Our Saviour has shown his own great example in loving us when we were enemies.