I saw Abal Ḥasan the First (Imam Kāżim (a.s.)), Hārūn the (Abbasid) caliph, ‘Isā ibn Ja’far, and Ja’far ibn Yaḥyā all in Madīnah next to the grave of the Prophet (s.a.a.w.). Hārūn said to Imam Kāżim (a.s.), “Go ahead (and say Salām to the Messenger of Allāh (s.a.a.w.)).” However, Imam (a.s.) refused. So Hārūn went ahead and said Salām to the Messenger of Allāh (s.a.a.w.) and then moved aside. Then ‘Isā ibn Ja’far asked Imam (a.s.) to go ahead and say Salām to the Prophet (s.a.a.w.). However, Imam (a.s.) refused. So ‘Isā moved forward and said Salām to the Messenger of Allāh (s.a.a.w.) and then moved aside and stood with Hārūn. Then Ja’far ibn Yaḥyā asked Imam (a.s.) to go ahead and say Salām to the Prophet (s.a.a.w.). However, Imam (a.s.) refused. So Ja’far moved forward and said Salām to the Messenger of Allāh (s.a.a.w.) and then he also moved aside and stood with Hārūn. Then Abul Ḥasan (a.s.) moved forward and said: Salam to you, O father! I ask Allāh who selected you, chose you, guided you, and guided (the creation) through you, to send His blessing on you. So Hārūn said to ‘Isā, “Did you hear what he said?” “Yes,” ‘Isā replied. “I testify that he (the Messenger of Allāh (s.a.a.w.)) is truly his father,” Hārūn said.