John Gill 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 more than his
beginning
Which verified the words of Bildad, (Job 8:6Job 8:7) ; though they were spoken by him only by way of supposition.

All blessings are of the Lord, temporal and spiritual; and sometimes the last days of a good man are his best, as to temporal things, as were David's, and here Job's; though this is not always the case.

However, if their last days are but the best in spiritual things, that is enough: if they have more faith, hope, love, patience, humility, and self-denial, and resignation of will to the will of God; are more holy, humble, spiritually and heavenly minded; have more light and knowledge in divine things; have more peace and joy, and are more fruitful in every good work, and more useful.

And often they are in their very last moments most cheerful and comfortable: the best wine is reserved till last;

for he had fourteen thousand sheep, and six thousand camels, and a
thousand yoke of oxen, and a thousand she asses :
just double the number of each of what he had before, (Job 1:3) .