Sahih al-Bukhari 2885

It is related that Abu Wa'il said, "We were at Siffin and Sahl ibn Hunayf stood up and said, 'O people! Hve doubts about yourselves! We were with the Messenger of Allah, may Allah bless him and grant him peace, on the Day of al-Hudaybiyya, and if we had thought it proper to fight, we would have fought. 'Umar ibn al-Khattab came and said, 'O Messenger of Allah, do we not have the truth while our enemy have the false?' He said, 'Yes indeed.' He said, "Are not our dead in the Garden while their dead are in the Fire?' He said, 'Yes indeed.' He said, Then why do we concede humbleness in our deen? Will we go back without Allah having judged between us and them?' He said, 'O Ibn al-Khattab, I am the Messenger of Allah and He will never neglect me.' Then 'Umar went to Abu Bakr and said to him the like of what he had said to the Prophet, may Allah bless him and grant him peace, and Abu Bakr said, 'He is the Messenger of Allah, may Allah bless him and grant him peace, and He will never neglect him.' Then Surat al-Fath (48) was sent down and the Messenger of Allah, may Allah bless him and grant him peace, read it to 'Umar to the end of it and 'Umar said, 'Messenger of Allah, was that the victory?' He answered, 'Yes.'"