Albert Barnes Commentary Job 27:3

"(For my life is yet whole in me, And the spirit of God is in my nostrils);" — Job 27:3 (ASV)

And the spirit of God is in my nostrils - As long as I live. The “spirit of God” here means the breath that God breathed into man when he created him (Genesis 2:7). It would seem probable that there was an allusion to that fact by the language here, and that the knowledge of the way in which man was created was thus handed down by tradition.