Psalms 109:6

Overview - Psalms 109
David, complaining of his slanderous enemies, under the person of Judas devotes them.
16 He shews their sin.
21 Complaining of his own misery, he prays for help.
29 He promises thankfulness.
Treasury of Scripture Knowledge

Psalms 109:6  (King James Version)
Set thou a wicked man over him: and let Satan stand at his right hand.

Set thou
Dr. Sykes, Michaelis, and others, contend that these imprecations are those of David's enemies against himself; and they would render, "Set, say they, a wicked," etc: but this is rendered highly improbable by the 8th verse being applied by St. Peter to the traitor Judas, of whom David was certainly not a type
(See ver. 20.) Bp. Horsley and others, however, render the verbs in the future tense, the first verb alone being in the imperative; justly considering the Psalmist as merely uttering prophetic denunciations of God's displeasure against sinners.
Matthew 27:4

and let
Zechariah 3:1 ; John 13:2 John 13:27

or, an adversary.
Matthew 5:25