Proverbs 25:4-5; Proverbs 25:21-22

4 Remove the dross from the silver, and out comes material for the silversmith; 5 remove the wicked from the king's presence, and his throne will be established through righteousness.
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.