Deuteronomy 32:44

42I 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.”

43Rejoice, 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.

44Moses came and spoke all the words of this song in the ears of the people, he and Joshua the son of Nun.

45Moses finished reciting all these words to all Israel.

46He said to them, “Set your heart to all the words which I testify to you today, which you shall command your children to observe to do, all the words of this law.