Deuteronomy 32:41-43

41If I shall whet my glittering sword, and my hand take hold on judgment; I will render vengeance to my enemies, and will reward them that hate me. 42I will make my arrows drunk with blood, and my sword shall devour flesh; and that with the blood of the slain and of the captives, from the beginning of revenges upon the enemy. 43Rejoice, O ye nations, with his people: for he will avenge the blood of his servants, and will render vengeance to his adversaries, and will be merciful to his land, and to his people.1