'Fierce Anger' in the Bible

The Lord said to Moses, “Take all the leaders of the people [who have committed sin with the Moabites], and execute them in broad daylight before the Lord, so that the fierce anger of the Lord may turn away from Israel.”

Now look, you [the tribes of Reuben and Gad] have risen up in your fathers’ place, a brood of sinful men, to add still more to the fierce anger of the Lord against Israel.