Imam Ja’far as-Sadiq (a.s.) narrates:
“When Hazrat Yaqūb (a.s.) went to Egypt to meet his son Hazrat Yūsuf (a.s.), he (Yūsuf a.s.) did not alight from his horse to pay respect to his father. Hazrat Jibrīl (a.s.) descended, and told Hazrat Yūsuf (a.s.) to open his fist. As he did so, a light shot out from his palm and rose towards the sky. Hazrat Yūsuf (a.s.) enquired, “What was this light which came out of my hand and shot to the sky?.” Jibrīl (a.s.) replied, “The light of Prophethood has departed from your loins. You did not pay due respect to your father hence none of your descendants will get Prophethood.” It is true that Hazrat Yūsuf (a.s.) did not descend from his horse to pay respect to his father. However, this was not due to any feelings of pride and vanity. The Prophets are sinless and could never harbour such emotions. His intentions were merely to maintain his dignity as a King among his subjects.”