Deuteronomy 32:41-43

41if I sharpen my flashing sword and my hand takes hold on judgment, I will take vengeance on my adversaries and will repay those who hate me.

42I will make my arrows drunk with blood, and my sword shall devour flesh— with the blood of the slain and the captives, from the long-haired heads of the enemy.'

43"Rejoice with him, O heavens; bow down to him, all gods, for he avenges the blood of his children and takes vengeance on his adversaries. He repays those who hate him and cleanses his people's land."