Therefore the Lord heard this, and was wroth - See Numbers 11:1, Numbers 11:10.
So a fire was kindled against Jacob ... - Fire may be used here, as in Numbers 11:1, as an emblem of wrath; a fire may have been literally sent down to consume them.
Related Commentaries of Psalms 78:21
Psalms 78:21
21 Therefore the LORD heard this, and was wroth: so a fire was kindled against Jacob, and anger also came up against Israel;