John Gill Commentary Job 1:12

"And Jehovah said unto Satan, Behold, all that he hath is in thy power; only upon himself put not forth thy hand. So Satan went forth from the presence of Jehovah." — Job 1:12 (ASV)

And the Lord said to Satan, behold, all that he has is in
your power
This he said not as angry and displeased with Job, or as entertaining any ill opinion of him through the suggestions of Satan, nor as gratifying that evil spirit; but in order to convince and confound him, and to try the grace of Job, that he might shine the brighter; and it may be observed, that the Lord alone had the sovereign dispose of all that Job had, and that Satan could have no power over him or his, but what was given him:

only upon himself put not forth your hand ;
thus the Lord restrained Satan, who could do nothing without his leave, and limits and bounds the present affliction of his servant to his family and estate; reserving his person and the health of it for another temptation and trial:

so Satan went forth from the presence of the Lord ;
the Targum adds, "with power", authority, liberty of acting; not from his general presence, which is everywhere, from which there is no going; nor from his gracious presence, in which he had not been; and much less his glorious presence in heaven, from which he had been cast long ago; but from the place where the sons and people of God worshipped, and where he granted his presence to them, and from conversing with God there: as soon as Satan had got leave, he at once went forth to execute what he had permission to do, glad at heart he had so far succeeded; and eager upon doing all the mischief he could to a man that was the butt of his malice, and the object of his envy and hatred; the sad effects and consequences of which follow.