Musar על בבא בתרא 41:6

The brothers observed that Joseph's face was inordinately radiant. We have a tradition that a person's wisdom is reflected in his facial features. The Holy Spirit that illuminated him, and which Joseph received through his father, caused the brothers to become jealous in a constructive manner, קנאה לשם שמים. This is similar to the jealousy among Torah scholars, a permissible or even desirable form of jealousy (Baba Batra 21a). The brothers therefore did not suspect Jacob of flattering Joseph; they merely worried that they themselves would not be granted similar insights.

Even though jealousy is a very bad quality, there are instances where it can be a very good quality and, in fact, it can be a most noble quality, — when one envies those who revere God, as it is said : "Let not thy heart envy sinners, but those that fear the Lord all the day…" (Prov. 23:17). And in the same way our Sages said : "that the jealousy of wise men increases wisdom" (Baba Bathra 21a). When one sees another studying, it should excite his envy and he should say "This man studies all day, I shall do the same!" And similarly in the matter of all he commandments. Everyone should envy his companion and try to emulate the good deeds of his companion. If he sees a wicked man who has even one good quality, he should envy him for that and should emulate it. But a man who envies his companion when he sees him occupying himself with Torah and with good deeds and does not envy him in order to emulate him, and does not say to himself, "This man is doing thus; I will also do thus!" but rather thinks in his heart enviously, "Because this companion has more good qualities than I, because of all this he is more honored by men," and then this envious man will plot how to confuse and take his companion away from the study the Torah and good deeds, such envy is a grievous disease, and he who deals in such envy is a sinner and one who causes others to sin. He is truly a partner of Jereboam, the son of Nebat.