John Calvin Commentary Genesis 42:27

"And as one of them opened his sack to give his ass provender in the lodging-place, he espied his money; and, behold, it was in the mouth of his sack." — Genesis 42:27 (ASV)

And as one of them opened his sack. The intention with which Joseph had commanded the price paid for the grain to be secretly deposited in his brothers' sacks can easily be conjectured: he feared that his father, being already impoverished, would not be able to buy provisions again.

The brothers, having found their money, did not know where to seek the cause, except that, being terrified, they perceived that God's hand was against them. Their great astonishment is evident from their not voluntarily returning to Joseph to prove their own innocence, for the remedy for the problem was near at hand, if they had not been utterly blinded.

Therefore, we must ask God to supply us in doubtful and troubled affairs with not only fortitude but also prudence. We also see how little can be effected even by a great multitude, unless the Lord presides among them.

The sons of Jacob should have exhorted each other and consulted together about what needed to be done. But all deliberation ceased; no solace or remedy was suggested. Even as each one saw the others agitated, they mutually increased each other’s trepidation. Therefore, the companionship and support of men will profit us nothing, unless the Lord strengthens us from heaven.