Then Satan answered the Lord, and said, doth Job fear God for nought. Satan does not deny any part of Job's character, nor directly charge him with anyone sin; which shows what a holy man Job was, how exact in his life and conversation, that the devil could not allege any one thing against him; nor does he deny that he feared the Lord; nay, he owns it, only suggests there was a private reason for it; and this he dares not affirm, only puts it by way of question, giving an innuendo, which is a wretched way of slander many of his children have learnt from him: he insinuates that Job's fear of God, and serving him, was not "for nought", or "freely" , it was not out of love to him, or with any regard to his will, or his honour and glory, but from selfish principles, with mercenary views, and for worldly ends and purposes: indeed no man fears and serves the Lord for nought and in vain, he is well paid for it; and godliness has a great gain along with it, the Lord bestows everything, both in a temporal and spiritual way, on them that fear him; so that eventually, and in the issue, they are great gainers by it; and they may lawfully look to these things, in order to encourage them in the service and worship of God, even as Moses had respect to the recompence of reward; when they do not make these, but the will and glory of God, the sole and chief cause and end thereof: but the intimation of Satan is, that Job's fear was merely outward and hypocritical, nor cordial, hearty, and disinterested, but was entirely for his own sake, and for what he got by it; and this he said as if he knew better than God himself, the searcher of hearts, who had before given such an honourable character of him.
Sephorno observes, that he supposes that his fear was not a fear of the greatness of God, a reverence of his divine Majesty, but a fear of punishment; or what we call a servile fear, and not a filial one.