His mischief returns upon his own head, and on his own skull his violence descends.
PSALM 7 David, loaded with unjust calumny, calls upon God to be his advocate and defender, and commits his innocence to the Divine protection. In the first place, he protests that his conscience did notaccuse him of the wickedness laid to his charge. Secondly, he shows how greatly it concerns the glory of God that he should execute judgment against the ungodly.
Commenting on Psalm 7:1-17
The rod which he lifted on high, has smitten his own back. He shot an arrow upward, and it has "returned upon his own head." He hurled a stone at another and it has "come down upon his own pate." Curses are like young chickens, they always come home to roost. Ashes always fly back in the face of him that throws them.
David having lodged his appeal with God by prayer and a solemn profession of his integrity, in the former part of the psalm, in this latter part does, as it were, take out judgment upon the appeal, by faith in the word of God, and the assurance it gives of the happiness and safety of the righteous and the certain destruction of wicked people that continue impenitent. I.
Commenting on Psalm 7:10-17