Numbers 11:1

And the people murmured sinfully before the Lord; and the Lord heard [them] and was very angry; and fire was kindled among them from the Lord, and devoured a part of the camp.

And when the people complained, it displeased the Lord: and the Lord heard it; and his anger was kindled; and the fire of the Lord burnt among them, and consumed them that were in the uttermost parts of the camp.

The people were complaining in the ears of Yahweh. When Yahweh heard it, his anger burned; and Yahweh’s fire burned among them, and consumed some of the outskirts of the camp.