Lower parts of the earth - They are appointed, in the just judgment of God, to destruction; they shall be slain and buried in the earth, and shall be seen no more. Some understand the passage as referring to the punishment of hell; which many supposed to be in the center of the earth.
So the old Psalter, - Thai sall entir in till lagher pine of hell. Lahher or laigher, lower, undermost.
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.