'Fierceness' in the Bible

Therefore he poured the fierceness of his anger on him, and the strength of battle; and it set him on fire all around, but he didn't know; and it burned him, but he didn't take it to heart."

For, behold, Yahweh will come with fire, and his chariots shall be like the whirlwind; to render his anger with fierceness, and his rebuke with flames of fire.