Deuteronomy 32:42 in the King James Version
I will make mine 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.
Context
41 if I sharpen my glittering sword, my hand grasps it in judgment; I will take vengeance on my adversaries, and will repay those who hate me.
42 I will make my arrows drunk with blood. My sword shall devour flesh with the blood of the slain and the captives, from the head of the leaders of the enemy.”
43 Rejoice, you nations, with his people, for he will avenge the blood of his servants. He will take vengeance on his adversaries, and will make atonement for his land and for his people.