Genesis 37:4

“And when his brethren saw that their father loved him more than all his brethren, etc.] Which they perceived by various things in his behaviour to him, by his words, his looks, his gestures, and particularly by the coat he had made him, which distinguished him from the rest: they hated him, and could not speak peaceably unto him; they not only inwardly hated him, but they could not conceal their hatred, but betrayed it by their speech unto him; they could not speak to him on any occasion, but in a cross, surly, ill natured manner; they could not salute him, or give him the common salutation, Peace be to thee, as Aben Ezra suggests.”

“could not speak peaceably unto him--did not say "peace be to thee" [Gen 43:23, &c.], the usual expression of good wishes among friends and acquaintances. It is deemed a sacred duty to give all this form of salutation; and the withholding of it is an unmistakable sign of dislike or secret hostility. The habitual refusal of Joseph's brethren, therefore, to meet him with "the salaam," showed how ill-disposed they were towards him. It is very natural in parents to love the youngest, and feel partial to those who excel in talents or amiableness. But in a family constituted as Jacob's--many children by different mothers--he showed great and criminal indiscretion.”

“- 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…”

“37:4 Jacob’s favoritism toward Joseph inflamed his other sons’ hatred of their brother. Just as Isaac’s and Rebekah’s favoritism had separated their family, Jacob’s favoritism would separate him from his son Joseph.”