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

4 Take away the dross from the silver, And there comes out a vessel for the smith; 5 Take away the wicked before the king, And his throne will be established in righteousness.
21 If your enemy is hungry, give him food to eat; And if he is thirsty, give him water to drink; 22 For you will heap burning coals on his head, And the LORD will reward you.