Deuteronomy 32:41-43

41 if I sharpen My flashing sword and My hand takes hold on judgment, I will render vengeance on My enemies and will repay those who hate Me.

42 I will make My arrows drunk with blood, and My sword shall devour flesh, with the blood of the slain and of the captives, from the heads of the leaders of the enemies.

43 Rejoice, O you nations, with His people; for He will avenge the blood of His servants and will render vengeance on His adversaries and will be merciful to His land and people.