Albert Barnes Commentary Psalms 35:5

"Let them be as chaff before the wind, And the angel of Jehovah driving [them] on." — Psalms 35:5 (ASV)

Let them be as chaff before the wind—As chaff is driven away in winnowing grain. See the notes at (Psalms 1:4).

And let the angel of the Lord chase them—Drive them away, or scatter them. Angels are often represented in the Scriptures as agents employed by God in bringing punishment on wicked people. See (2 Kings 19:35); (Isaiah 37:36); (1 Chronicles 21:12); (1 Chronicles 21:30); (2 Samuel 24:16).