Deuteronomy 32:41-47

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."

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

45And when Moses had finished speaking all these words to all Israel,

46he said to them, "Take to heart all the words by which I am warning you today, that you may command them to your children, that they may be careful to do all the words of this law.

47For it is no empty word for you, but your very life, and by this word you shall live long in the land that you are going over the Jordan to possess."