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 Psalms 109:8 being applied by St. Peter to the traitor Judas, of whom David was certainly not a type. (See Psalms 109:20.) 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
Satan: or, an adversary, Matthew 5:25