Al-Lu'lu Wal-Marjan 1168 — The Book of Al-Jihad (Fighting for Allâh's Cause)

Abû Wâ'il Narrated from:

We were in Siffin and Sahl bin Hanaif 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-Khattâb came and said, 'O Allâh's Messenger! Aren't we on the right path and our opponents on the wrong?' Allâh'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 Allâh judges between us and them?' Allâh's Messenger ﷺ said, 'O Ibn Al-Khattâb! I am the Messenger of Allâh and Allâh will never degrade me.'Then 'Umar went to Abû Bakr and told him the same as he had told the Prophet ﷺ. On that Abû Bakr said (to 'Umar), 'He is the Messenger of Allâh and Allâh will never degrade him.' Then Surah Al-Fath (i.e. Victory) was revealed and Allâh's Messenger ﷺ recited it to the end in front of 'Umar. On that 'Umar asked, 'O Allâh's Messenger! Was it (i.e. the Hudaibiya Treaty) a victory?' Allâh's Messenger ﷺ said, 'Yes.' " ( Sahîh Al-Bukhâri, Hadîth No. 406, Vol. 4)