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

4 Take away the dross from the silver, and there shall come forth a vessel for the refiner. 5 Take away the wicked from the presence of the king, and his throne shall be established in righteousness.
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.