The Messenger of Allah ﷺ addressed us on the Day of Uqba, saying, "People, your blood and your wealth are sacred to one another until you meet your Lord, just as this day of yours is sacred, in this land of yours, in this month of yours. Have I conveyed the message?"They replied, "Yes."He said, "O Allah, bear witness that I have conveyed it."
خطبنا رسول الله ﷺ يوم العقبة، فقال: يا أيها الناس، إن دماءكم وأموالكم عليكم حرام إلى أن تلقوا ربكم، كحرمة يومكم هذا، في بلدكم هذا، في شهركم هذا، ألا هل بلغت؟ قالوا: نعم. قال: اللهم هل بلغت.
Imam Ahmad (16699) narrated it from Abdul-Samad bin Abdul-Warith, who said, Rabia bin Kulthum told us, who said, my father told me, from Abu Ghadiyah Juhani, and he mentioned it. Tabarani also narrated it in Al-Kabir (22/363) through another route from Muslim bin Ibrahim, who said, Rabia bin Kulthum told us, who said, my father told us, saying, I was at Wasit al-Qasab with Abdul-Ala bin Abdullah bin Amir, when the doorkeeper said, "This is Abu Ghadiyah Juhani." Abdul-Ala said, "Let him in." So he entered wearing his patched garments, a tall man, powerfully built, as if he were not from this nation. When he sat down, he said, "I pledged allegiance to the Messenger of Allah ﷺ." I said, "With your right hand?" He said, "Yes. He addressed us on the day of Aqabah and said, 'O people, indeed your blood and your wealth are forbidden to you just as this day of yours is forbidden, in this month of yours, in this land of yours. Have I not conveyed this?' They said, 'Yes.' He said, 'O Allah, bear witness.' Then he said, 'Do not return after me to disbelief, striking each other's necks.'"He said, "We used to consider Ammar bin Yasir among the best of us. Then on the day of Siffin, he came walking on foot at the front of the battalion until, when he was between the two ranks, he stabbed a man in the knee with a spear. The man stumbled and his helmet fell off, so I struck him, and it turned out to be Ammar's head." He said, a freed slave of ours says, "Which hand struck him down?" He said, "I have never seen a man whose misguidance was clearer to me than his, for he had heard from the Prophet ﷺ what he had heard, and yet he killed Ammar." End of narration.Its chain is hasan, due to some discussion regarding Kulthum, who is Kulthum bin Jabr Basri, about whom there is disagreement, though his hadith is hasan. This Abu Ghadiyah Juhani's name was Yasar bin Sabi, though it is also said to be Yasar bin Azhar. He met the Prophet ﷺ while still a boy and did hear from the Prophet ﷺ. He was devoted to Uthman, and he was the killer of Ammar bin Yasir. Whenever he sought permission to enter upon Muawiya or others, he would say, "The killer of Ammar is at the door!"Ibn Abdul-Barr said in his biographical entry in Al-Istiab, "There is something remarkable about his story in the view of the scholars. He reported from the Prophet ﷺ what we have mentioned that he heard from him, yet he then killed Ammar. Kulthum bin Jabr reported from him."Hafiz said in Al-Isabah, "The assumption regarding the companions in those wars is that they were acting on their own interpretation, and the one who exercises independent judgment and errs still has a reward. If this is established regarding ordinary individuals, then it is established for the companions with even greater justification."