O, Lord, thou hast 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; Psalms 6:5, note.
Thou hast kept me alive, that I should not go down to the pit - More literally, “thou hast caused me to live from them which go down to the pit;” that is, thou hast distinguished me from them by keeping me alive. The word “pit” here means the same as the grave. See the notes at Psalms 28:1.