Albert Barnes Commentary Psalms 63:9

"But those that seek my soul, to destroy it, Shall go into the lower parts of the earth." — Psalms 63:9 (ASV)

But those that seek my soul to destroy it - Who seek my life; who endeavor to kill me. This language would well describe the purposes of Absalom and his followers.

Shall go into the lower parts of the earth - Shall descend into the earth; into the deepest graves. He would live; but they would perish.