Musar zu Mischlej 16:11

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."