John Gills Exposition of the Bible Commentary - Genesis 37:31
And they took Joseph's coat ,.... After they had told Reuben what they had done with him, who being willing to make the best of things as it was, joined with them in the following scheme: by this it appears, that when they took Joseph out of the pit they did not put his coat on him, but sold him naked, or almost so, to the merchants: and killed a kid of the goats, and dipped the coat in the blood ; that being, as the Targum of Jonathan and Jarchi observe, most like to human blood. read more
Matthew Henry's Complete Commentary - Genesis 37:31-36
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... read more