John Trapp on Psalms 78:21

Verſ. 21. Therefore the Lord heard this, and was wroth] Efferbuit, excanduit. Anger is a kind of fire, a boyling of the blood about the heart, thorough deſire of revenge. But fury is not in mee, ſaith God, Iſa. 27.4. If anger be aſcribed unto him, as here, it is an expreſſion fitted to our apprehenſion, becauſe he doeth that which angry men uſe to do, viz. chide, and ſmite for ſin; but all in a way of juſtice, and without the leaſt perturbation.

So a fire was kindled] It began to ſmoak and burn.

And anger alſo came up] Aſcended, i. e. Flamed, for anger beginneth at the heart, and then commeth up into the brain, face, noſtrils.