Citazione Commento su II Samuele 19:33

והוא נער את בני בלהה. “and he was a lad keeping company with the sons of Bilhah.” Rashi interprets this as Joseph’s immaturity, acting childishly. Onkelos interprets this to mean that already from his earliest youth, Joseph preferred the company of the sons of Bilhah who looked up to him and flattered him. Nachmanides writes that the words והוא נער, refer to what has been written previously, so that we have to understand the sequence of the verse as follows: “these are the developments in the house of Yaakov; Joseph, who was a lad of 17 years used to tend the sheep together with his brothers.” Ibn Ezra interprets the verse to mean that because Joseph was still immature at 17, the sons of Bilhah made him their personal valet. The Torah suggests that if Joseph had acted as valet to the sons of Yaakov’s real wives no problems would have arisen at all. This is the meaning of the דבתם רע, the evil reports Joseph brought to his father concerning the conduct of the sons of Leah. Joseph resented being assigned to being a valet to the sons of the handmaids. It is also possible that due to his youth, the Torah refers to him as נער, even though physically speaking he was fully grown. We encounter something similar with Avshalom, son of David, who was also referred to as נער, not because he was so young in years at that time, but because he was younger than his brothers. (Samuel II 19,33)

a great man here denotes a wealthy man ( cf . the description of Barzillai [II Samuel 19:33]).