It happened at midnight, that Yahweh struck all the firstborn in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the captive who was in the dungeon; and all the firstborn of livestock.

I will strike them with the pestilence, and disinherit them, and will make of you a nation greater and mightier than they."

Moses said to Aaron, "Take your censer, and put fire from off the altar in it, and lay incense on it, and carry it quickly to the congregation, and make atonement for them; for wrath has gone out from Yahweh! The plague has begun."

He made a path for his anger. He didn't spare their soul from death, but gave their life over to the pestilence,

Yahweh is a jealous God and avenges. Yahweh avenges and is full of wrath. Yahweh takes vengeance on his adversaries, and he maintains wrath against his enemies.

And

Then the earth shook and trembled. The foundations also of the mountains quaked and were shaken, because he was angry.

Burning coals

[They shall be] wasted with hunger, and devoured with burning heat and bitter destruction. I will send the teeth of animals on them, With the poison of crawling things of the dust.

General references

He encloses the face of his throne, and spreads his cloud on it.

His breath kindles coals. A flame goes forth from his mouth.

A fire goes before him, and burns up his adversaries on every side.