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 finer . 5 Take away the wicked from before 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.