Deuteronomy 32:44

42I 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.

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 unto his land, and to his people.

44And Moses came and spake all the words of this song in the ears of the people, he, and Hoshea the son of Nun.

45And Moses made an end of speaking all these words to all Israel:

46And he said unto them, Set your hearts unto all the words which I testify among you this day, which ye shall command your children to observe to do, all the words of this law.