While Hasan bin Ali was delivering a sermon after Ali had been killed, a tall, dark-skinned man from the tribe of Azd stood up and said, "I saw the Messenger of Allah ﷺ placing him in his lap, saying, 'Whoever loves me, let him love this one. Let those present convey it to those who are absent.' Were it not for the Messenger of Allah's ﷺ command, I would not have told you this."
بينما الحسن بن علي يخطب بعدما قتل علي، إذ قام رجل من الأزد آدم طوال، فقال: لقد رأيت رسول الله ﷺ واضعه في حبوته، يقول: من أحبني فليحبه، فليبلغ الشاهد الغائب ولولا عزمة رسول الله ﷺ ما حدثتكم.
Ahmad (23106) narrated it from Muhammad bin Jafar, who said, Shuba narrated to us, from Amr bin Mura (that is, Jamali), from Abdullah bin Harith (that is, Zubaydi), from Zuhayr bin Aqmar, who said, and then he related it.Hakim (3/173–174) graded it sahih by this route. Its chain is hasan because of Zuhayr bin Aqmar, for his hadith is hasan, as Nasai, Ibn Hibban, and Ajli all deemed him reliable.Haythami mentioned it in Majma (9/176) and said, "Ahmad narrated it, and it contains someone I do not know." But all the narrators in the chain are known except for the companion, so perhaps he meant the companion by this remark. The companions being unidentified does no harm.