Albert Barnes Commentary Psalms 30:3

"O Jehovah, thou hast brought up my soul from Sheol; Thou hast kept me alive, that I should not go down to the pit." — Psalms 30:3 (ASV)

O, Lord, you have brought up my soul from the grave — My life; me. The meaning is that he had been in imminent danger of death and had been brought from the borders of the grave. The word here rendered “grave” is “Sheol”—a word which, properly used, commonly denotes the region of the dead; the underworld which is entered through the grave. Compare Isaiah 14:9 (note) and Psalm 6:5 (note).

You have kept me alive, that I should not go down to the pit — More literally, “You have caused me to live from them who go down to the pit;” that is, you have distinguished me from them by keeping me alive. The word “pit” here means the same as the grave. See the notes at Psalm 28:1.