Sahih al-Bukhari 2884

It is related that al-A'mash said, "I asked Abu Wa'il, 'Were you present at Siffin?' He answered, 'Yes, and I heard Sahl ibn Hunayf say, "Have doubts about your opinions! You should have seen me on the day when Abu Jandal came! 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 did not remove our swords from our shoulders for something which outraged us, and it was easier for us to recognise (the good in it) which is not the case in this business of ours."'" [Siffin was the battle between 'Ali and Mu'awiya. Sahl was criticised for his lack of enthusiasm for the fight. Abu Jandal came to the Muslims in chains after the Treaty of al-Hudaybiyya had been concluded, and was handed back to Quraysh according to the terms of the treaty.]