Genesis 37:31

31.And they took Joseph’s coat. They now return to their first scheme. In order that their father may have no suspicion of their crime, they send the bloody coat, from which he might conjecture that Joseph had been torn by some wild beast. Although Moses alludes to this briefly, I yet think that they rather sent some of their servants, who were not accessory to the crime, than any of their number. For he says soon afterwards, that his sons and daughters came to offer some consolation to him in his grief. And although in the words they use, there lurks some appearance of insult, it seems to me more probable that they gave this command to avert suspicion from themselves. For they feign themselves to be of confused mind, as is usual in affairs of perplexity. Yet whatever they intend, their wickedness drives them to this point, that they inflict a deadly wound upon the mind of their father. This is the profit which hypocrites gain by their disguises, that in wishing to escape the consequences of one fault, they add sin to sin. With respect to Jacob, it is a wonder that after he had been tried in so many ways, and always come forth a conqueror, he should now sink under grief. Certainly it was very absurd that the death of his son should occasion him greater sorrow than the incestuous pollution of his wife, the slaughter of the Shechemites, and the defilement of his daughter. Where was that invincible strength, by which he had even prevailed over the angel? Where the many lessons of patience with which God had exercised him, in order that he might never fail? This disposition to mourn, teaches us that no one is endued with such heroic virtues, as to be exempt from that infirmity of the flesh, which betrays itself sometimes even in little things; whence also it happens, that they who have long been accustomed to the cross, and who like veteran soldiers ought bravely to bear up against every kind of attack, fall like young recruits in some slight skirmish. Who then among us may not fear for himself, when we see holy Jacob faint, after having given so many proofs of patience?