My breath; which is the constant companion and certain sign of life, both coming in with it, Genesis 2:7, and going out with it, 1 Kings 17:17 Psalms 144:4. Or, my soul, or life. The spirit of God; that spirit or soul which God breathed into me, Genesis 2:7, and preserveth in me. Or rather, the breath of God, i.e. which God breathed into me, which eminently appears in a man's nostrils.
Related Commentaries of Job 27:3
Job 27:3
3 All the while my breath is in me, and the spiritc of God is in my nostrils;