But. This verse describes what happens while he is alive. See below.
his soul. he himself. Hebrew. nephesh. App-13.
within. over.
mourn: i.e. mourn "over himself". Hebrew. 'alaiv, as in Hosea 10:5.
Related Commentaries of Job 14:22
Job 14:22
22 But his flesh upon him shall have pain, and his soul within him shall mourn.