Musar su Genesi 37:3

ויעש לו כתונת פסים . The Talmud in Shabbat 10b tells us that one must not treat any of one's children differently, since, on account of the extra two silver-coins-worth of money spent on Joseph's colored coat his brothers became jealous of him and this in turn led to the exile in Egypt.

And Chazal say concerning this in the Midrash (Midrash Rabbah): "(Mishlei 16:11): 'A scale and just balances are the L-rd's' — for all of them he was punished measure for measure. For 'they call their brothers servants' — Jacob was sold as a servant. For 'they are suspect of illicit relations' — all of Egypt suspected him with the wife of Potiphar. For 'they are suspect of eiver min hachai' because he did not see them perform shechitah — this was a mistake, and Scripture thus apprises us (Bereshith 37:3): 'And they slaughtered a kid of goats' (after having sold him) and did not eat it live."

(Bereshith 37:3): "And Israel loved Joseph more than all of his sons, for he was the son of his old age.": Scripture hereby apprises us that Jacob did not accept the lashon hara that Joseph brought to him, and loved him only because he was the son of his old age.