John Gill Commentary Psalms 28:4

"Give them according to their work, and according to the wickedness of their doings: Give them after the operation of their hands; Render to them their desert." — Psalms 28:4 (ASV)

Give them according to their deeds
According to the demerit of them, which is death, even death eternal;

and according to the wickedness of their endeavours ;
for though wicked men do not always succeed; yet their want of success does not excuse their wickedness;

give them after the work of their hands ;
see (2 Timothy 4:14) ;

such petitions are not contrary to that Christian charity which the Gospel recommends; nor do they savour of a spirit of revenge, which is condemned by the word of God; for it should be observed, that these things are said with respect to men given up to a reprobate mind; and that the psalmist does not seek to avenge himself, nor to gratify his own mind; but he sought the glory of God, and moreover spoke by a prophetic spirit, knowing what was the will of God in this case; see (2 Timothy 4:14) ; and therefore these petitions of his are not to be drawn into an example in common and ordinary cases.