Hast not thou made an hedge about him, &c.— i.e. Hast thou not protected him with a thorny and inaccessible defence? The word rendered increased, is a metaphor, taken from waters which have burst their bounds, and spread themselves on all sides round; so Job's substance had largely increased, and spread itself like a flowing torrent over the adjacent land. Schultens.
Related Commentaries of Job 1:10
Job 1:10
10 Hast not thou made an hedge about him, and about his house, and about all that he hath on every side? thou hast blessed the work of his hands, and his substancee is increased in the land.