Psalm 109:6
Set thou a wicked man over him: and let Satan stand at his right hand.
Cross-references
Psalm 109:8 continues the imprecation from verse 6 — asking for his days to be few and another to take his office.
Psalm 109:20 sums up the curses against the accusers, including the request in verse 6 for a wicked man to oppose them.
Psalm 5:10 also asks God to declare enemies guilty and cast them out — a direct parallel to the imprecatory plea here.
Psalm 55:15 calls for enemies to die and go down to Sheol — a strong imprecation matching the severity of the curse here.
Psalm 40:15 prays for enemies to be appalled — a similar imprecatory theme, though less specific than the accuser imagery.
Zechariah 3:1 depicts Satan standing at Joshua's right hand to accuse him — the same imagery as 'let an accuser stand at his right hand' here.