Proverbs 25:21-23

New International Version - UK

²¹ If your enemy is hungry, give him food to eat;
    if he is thirsty, give him water to drink.
²² In doing this, you will heap burning coals on his head,
    and the Lord will reward you.

²³ Like a north wind that brings unexpected rain
    is a sly tongue – which provokes a horrified look.