Bottoms of the mountains. — Literally, ends or cuttings off, as, in margin. So the Vulg. extrema montium. Mountains were in the Hebrew conception the pillars of the world (see Job 9:6; Job 26:11), having their foundations firmly planted in the sea. These “hidden bases of the hills” were therefore the verge of the earth itself, and one lost among them would be close on the under-world of death.
The earth with her bars... — Literally, the earth her bars behind me for ever; i.e., the earth’s gates were closed upon me for ever, there was no possibility of return. The metaphor of a gateway to sheôl is common (Isaiah 38:10, &c.), but the earth is nowhere else said to be so guarded. Ewald therefore proposes to read sheôl here. But it is quite as natural to imagine a guarded passage out of the land of the living as into the land of the dead.
Corruption. — Rather, pit. (See Note, Psalms 16:10.)