(18) باب
Narrated Abu Wail:
We were in Siffin and Sahl bin Hunaif got up and said, "O people! Blame yourselves! We were with the Prophet (ﷺ) on the day of Hudaibiya, and if we had been called to fight, we would have fought. But `Umar bin Al Khatab came and said, 'O Allah's Messenger (ﷺ)! Aren't we in the right and our opponents in the wrongs' Allah's Messenger (ﷺ) said, 'Yes.' `Umar said, 'Aren't our killed persons in Paradise and their's in Hell?' He said, 'Yes.' `Umar said, 'Then why should we accept hard terms in matters concerning our religion? Shall we return before Allah judges between us and them?' Allah's Messenger (ﷺ) said, 'O Ibn Al- Khattab! I am the Messenger of Allah and Allah will never degrade me. Then `Umar went to Abu Bakr and told him the same as he had told the Prophet. On that Abu Bakr said (to `Umar). 'He is the Messenger of Allah and Allah will never degrade him.' Then Surat-al-Fath (i.e. Victory) was revealed and Allah's Messenger (ﷺ) recited it to the end in front of `Umar. On that `Umar asked, 'O Allah's Messenger (ﷺ)! Was it (i.e. the Hudaibiya Treaty) a victory?' Allah's Messenger (ﷺ) said, "Yes".
Reference: Sahih al-Bukhari 3182
In-book reference: Book 58, Hadith 24
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 53, Hadith 406