Genesis 37:31

“And they took Joseph’s coat, etc.] 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.”

“they took Joseph's coat--The commission of one sin necessarily leads to another to conceal it; and the scheme of deception which the sons of Jacob planned and practised on their aged father was a necessary consequence of the atrocious crime they had perpetrated. What a wonder that their cruel sneer, "thy son's coat," and their forced efforts to comfort him, did not awaken suspicion! But extreme grief, like every other passion, is blind, and Jacob, great as his affliction was, did allow himself to indulge his sorrow more than became one who believed in the government of a supreme and all-wise Disposer.”

“- Joseph Was Sold into Egypt 17. דתין dotayı̂n Dothain, “two wells?” (Gesenius) 25. נכאת neko't “tragacanth” or goat’s-thorn gum, yielded by the “astragalus gummifer”, a native of Mount Lebanon. צרי tsērı̂y “opobalsamum,” the resin of the balsam tree, growing in Gilead, and having healing qualities. לט loṭ, λῆδον lēdon, “ledum, ladanum,” in the Septuagint στακτή staktē. The former is a gum produced from the cistus rose. The latter is a gum resembling liquid myrrh. 36. פוטיפר pôṭı̂yphar Potiphar, “belonging to the sun.” The sketch of the race of Edom, given in the preceding piece, we have seen, reaches down to the time of Moses. Accordingly, the history of Jacob’s seed, which is…”

“37:31-35 The old family propensity for deception seized the brothers’ imagination. Jacob had killed a young goat to deceive Isaac (27:5-17); now Jacob’s sons deceived him with a goat (see study note on 30:34-36).”