Sahih al-Bukhari 7308

Abu Hamza related that he heard al-A'mash say, "I asked Abu Wa'il, 'Were you present at Siffin?' He said, 'Yes, and I heard Sahl ibn Hunayf say... al-A'mash related that Abu Wa'il said, " Sahl ibn Hunayf said, 'People! Have doubts about your opinion about your deen*! I remember how I was on the day of Abu Jandal [Hudaybiyya*]! If I had been able to defy the order of the Prophet, may Allah bless him and grant him peace, I would have defied it. We have not put our swords on our shoulders in the case of something which outraged us but that they made the matter easy for us � except for this business of ours now.'" Al-A'mash said that Abu Wa'il said, "I was present at Siffin and Siffin was a wretched business." [* Al-Qastallani says: "Your fighting your brothers in Islam based on your ijtihad. *Hudaybiyya: after the treaty had been concluded with Quraysh, Abu Jandal arrived arrived in camp, dragging his chains. His relative demanded his return according to the terms of the treaty and the Prophet, may Allah bless him and grant him peace, returned him to them.]