יָשׁ֣וּב עֲמָל֣וֹ בְרֹאשׁ֑וֹ וְעַ֥ל קָ֝דְקֳד֗וֹ חֲמָס֥וֹ יֵרֵֽד׃
His mischief shall return upon his own head, And his violence shall come down upon his own pate.
Radak on Psalms
His iniquity shall return on his own head: – The treachery he has acted in his pursuit of me shall return on his own head,
Radak on Psalms
And his violence shall come down upon his own pate: – a repetition of the idea with a change of terms.