Albert Barnes Commentary Job 42:12

"So Jehovah blessed the latter end of Job more than his beginning: And he had fourteen thousand sheep, and six thousand camels, and a thousand yoke of oxen, and a thousand she-asses." — Job 42:12 (ASV)

So the Lord blessed the latter end of Job – namely, by giving him double what he had possessed before his calamities came upon him; see (Job 42:10).

For he had fourteen thousand sheep ... – The possessions listed here are, in each instance, exactly double what he possessed in the early part of his life. Regarding their value and the rank in society they indicated, see the notes at (Job 1:3).

The only thing omitted here, and not explicitly stated as doubled, was his “household” or “husbandry” (Job 1:3, margin). However, it is evident that this must have been increased in a corresponding manner to enable him to keep and maintain such flocks and herds.

We should not suppose that these possessions were granted to him all at once. Since he lived a hundred and forty years after his afflictions, he had ample time to accumulate this property.