Job 1:9-11

Then the Adversary answered the Lord, saying, “Has Job feared God for nothing? Have You not made a hedge around him, around his household, and around all that he has on every side? You have blessed the work of his hands, and his possessions have increased in the land. But stretch out Your hand now, and touch all that he has, and he will curse You to Your face.”
Job 1:9-11, Modern English Version (MEV)
 
There is a natural tendency to harbor some question about how strong someone’s belief really is when things seem to be going well for them and the seem to be greatly blessed by God. Matthew Henry states is like this in his Commentary on the Whole Bible:
 
V. The devil's base insinuation against Job, in answer to God's encomium of him. He could not deny but that Job feared God, but suggested that he was a mercenary in his religion, and therefore a hypocrite (Job_1:9): Doth Job fear God for nought? Observe, 1. How impatient the devil was of hearing Job praised, though it was God himself that praised him. Those are like the devil who cannot endure that any body should be praised but themselves, but grudge the just share of reputation others have, as Saul (1Sa_18:5, etc.) and the Pharisees, Mat_21:15. 2. How much at a loss he was for something to object against him; he could not accuse him of any thing that was bad, and therefore charged him with by-ends in doing good. Had the one half of that been true which his angry friends, in the heat of dispute, charged him with (Job_15:4, Job_22:5), Satan would no doubt have brought against him now; but no such thing could be alleged, and therefore, 3. See how slyly he censured him as a hypocrite, not asserting that he was so, but only asking, “Is he not so?” This is the common way of slanderers, whisperers, backbiters, to suggest that by way of query which yet they have no reason to think is true. Note, It is not strange if those that are approved and accepted of God be unjustly censured by the devil and his instruments; if they are otherwise unexceptionable, it is easy to charge them with hypocrisy, as Satan charged Job, and they have no way to clear themselves, but patiently to wait for the judgment of God. As there is nothing we should dread more than being hypocrites, so there is nothing we need dread less that being called and counted so without cause. 4. How unjustly he accused him as mercenary, to prove him a hypocrite. It was a great truth that Job did not fear God for nought; he got much by it, for godliness is great gain: but it was a falsehood that he would not have feared God if he had not got this by it, as the event proved. Job's friends charged him with hypocrisy because he was greatly afflicted, Satan because he greatly prospered. It is no hard matter for those to calumniate that seek an occasion. It is not mercenary to look at the eternal recompence in our obedience; but to aim at temporal advantages in our religion, and to make it subservient to them, is spiritual idolatry, worshipping the creature more than the Creator, and is likely to end in a fatal apostasy. Men cannot long
serve God and mammon.
 
VI. The complaint Satan made of Job's prosperity, Job_1:10. Observe, 1. What God had done for Job. He had protected him, made a hedge about him, for the defence of his person, his family, and all his possessions. Note, God's peculiar people are taken under his special protection, they and all that belong to them; divine grace makes a hedge about their spiritual life, and divine providence about their natural life, so they are safe and easy. He had prospered him, not in idleness or injustice (the devil could not accuse him of them), but in the way of honest diligence: Thou hast blessed the work of his hands. Without that blessing, be the hands ever so strong, ever so skilful, the work will not prosper; but, with that, his substance has wonderfully increased in the land. The blessing of the Lord makes rich: Satan himself owns it. 2. What notice the devil took of it, and how he improved it against him. The devil speaks of it with vexation. “I see thou hast made a hedge about him, round about;” as if he had walked it round, to see if he could spy a single gap in it, for him to enter in at, to do him a mischief; but he was disappointed: it was a complete hedge. The wicked one saw it and was grieved, and argued against Job that the only reason why he served God was because God prospered him. “No thanks to him to be true to the government that prefers him, and to serve a Master that pays him so well.”
 
VII. The proof Satan undertakes to give of the hypocrisy and mercenariness of Job's religion, if he might but have leave to strip him of his wealth. “Let it be put to this issue,” says he (Job_1:11); “make him poor, frown upon him, turn thy hand against him, and then see where his religion will be; touch what he has and it will appear what he is. If he curse thee not to thy face, let me never be believed, but posted for a liar and false accuser. Let me perish if he curse thee not;” so some supply the imprecation, which the devil himself modestly concealed, but the profane swearers of our age impudently and daringly speak out. Observe, 1. How slightly he speaks of the affliction he desired that Job might be tried with: “Do but touch all that he has, do but begin with him, do but threaten to make him poor; a little cross will change his tone.” 2. How spitefully he speaks of the impression it would make upon Job: “He will not only let fall his devotion, but turn it into an open defiance - not only think hardly of thee, but even curse thee to thy face.” The word translated curse is barac, the same that ordinarily, and originally, signifies to bless; but cursing God is so impious a thing that the holy language would not admit the name: but that where the sense requires it it must be so understood is plain form 1Ki_21:10-13, where the word is used concerning the crime charged on Naboth, that he did blaspheme God and the king. Now, (1.) It is likely that Satan did think that Job, if impoverished, would renounce his religion and so disprove his profession, and if so (as a learned gentleman has observed in his Mount of Spirits) Satan would have made out his own universal empire among the children of men. God declared Job the best man then living: now, if Satan can prove him a hypocrite, it will follow that God had not one faithful servant among men and that there was no such thing as true and sincere piety in the world, but religion was all a sham, and Satan was king de facto - in fact, over all mankind. But it appeared that the Lord knows those that are his and is not deceived in any. (2.) However, if Job should retain his religion, Satan would have the satisfaction to see him sorely afflicted. He hates good men, and delights in their griefs, as God has pleasure in their prosperity.