John Gill 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 they are; see (Psalms 1:4) ;

and let the angel of the Lord chase [them] ;
either a good angel, who is the Lord's, his creature that ministers unto him, and is ready to obey his orders; and who, as he encamps about the saints and protects them, so he is able to destroy their enemies; as one angel in a night destroyed all the firstborn in Egypt, and another the whole army of the Assyrians, (Exodus 12:29) (2 Kings 19:35) ; an angel of the Lord, who is swift to fly, and so to chase and overtake, and able to execute whatever is the will of the Lord;

or else an evil angel, who is the Lord's, being made by him, though not made evil by him; and who is under his restraints, and can do nothing but by his permission; and who sometimes is employed by the Lord, as the executioner of his wrath upon wicked men; is suffered to distress and torture their consciences in this life, and hereafter drag them into everlasting burnings, prepared for the devil and his angels.