Matthew Henry on Genesis 37:31–end
I. Joseph would soon be missed, great enquiry would be made for him, and therefore his brethren have a further design, to make the world believe that Joseph was torn in pieces by a wild beast; and this they did, 1. To clear themselves, that they might not be suspected to have done him any mischief. Note, We have all learned of Adam to cover our transgression, Job 31:33. When the devil has taught men to commit one sin, he then teaches them to conceal it with another, theft and murder with lying and perjury; but he that covers his sin shall not prosper long. Joseph's brethren kept their own and one another's counsel for some time, but their villany came to light at last, and it is here publish…
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Jacob rent his clothes, and put sackcloth upon his loins--the common signs of Oriental mourning. A rent is made in the skirt more or less long according to the afflicted feelings of the mourner, and a coarse rough piece of black sackcloth or camel's hair cloth is wound round the waist.
Adam Clarke on Genesis 37:33
Joseph is without doubt rent in pieces! - It is likely he inferred this from the lacerated state of the coat, which, in order the better to cover their wickedness, they had not only besmeared with the blood of the goat, but it is probable reduced to tatters. And what must a father's heart have felt in such a case! As this coat is rent, so is the body of my beloved son rent in pieces! and Jacob rent his clothes.
John Gill on Genesis 37:34
And Jacob rent his clothes,.... As expressive of his grief and mourning for the death of his son, as he supposed:
and put sackcloth upon his loins; put off his usual apparel, and put on a coarse garment on his loins next to his flesh, as another token of his great trouble and affliction for the loss of his son; which though afterwards was frequently done in times of public or private mourning, yet this is the first time we read of it; whether Jacob was the first that used it, whom his posterity and others imitated, is not certain; however it appears that this usage, as well as that of rending clothes on sorrowful occasions, were very ancient:
and mourned for his son many days: or years, as…