When Messenger of Allah ﷺ concluded a peace treaty with the people of Hudaibiya, ʿAli bin Abu Talib wrote the document and he mentioned in it, "Muhammad, Messenger of Allah ﷺ ." The pagans said, "Don't write: 'Muhammad, Messenger of Allah ﷺ', for if you were an apostle we would not fight with you." Allah's Apostle asked ʿAli to rub it out, but ʿAli said, "I will not be the person to rub it out." Messenger of Allah ﷺ rubbed it out and made peace with them on the condition that the Prophet ﷺ and his companions would enter Mecca and stay there for three days, and that they would enter with their weapons in cases.  

لَمَّا صَالَحَ رَسُولُ اللَّهِ ﷺ أَهْلَ الْحُدَيْبِيَةِ كَتَبَ عَلِيٌّ بَيْنَهُمْ كِتَابًا فَكَتَبَ مُحَمَّدٌ رَسُولُ اللَّهِ ﷺ فَقَالَ الْمُشْرِكُونَ لاَ تَكْتُبْ مُحَمَّدٌ رَسُولُ اللَّهِ لَوْ كُنْتَ رَسُولاً لَمْ نُقَاتِلْكَ فَقَالَ لِعَلِيٍّ امْحُهُ فَقَالَ عَلِيٌّ مَا أَنَا بِالَّذِي أَمْحَاهُ فَمَحَاهُ رَسُولُ اللَّهِ ﷺ بِيَدِهِ وَصَالَحَهُمْ عَلَى أَنْ يَدْخُلَ هُوَ وَأَصْحَابُهُ ثَلاَثَةَ أَيَّامٍ وَلاَ يَدْخُلُوهَا إِلاَّ بِجُلُبَّانِ السِّلاَحِ فَسَأَلُوهُ مَا جُلُبَّانُ السِّلاَحِ فَقَالَ الْقِرَابُ بِمَا فِيهِ  

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 ʿUmar bin Al Khatab came and said, 'O Messenger of Allah ﷺ! Aren't we in the right and our opponents in the wrongs' Messenger of Allah ﷺ said, 'Yes.' ʿUmar said, 'Aren't our killed persons in Paradise and their's in Hell?' He said, 'Yes.' ʿUmar said, 'Then why should we accept hard terms in matters concerning our religion? Shall we return before Allah judges between us and them?' Messenger of Allah ﷺ said, 'O Ibn Al- Khattab! I am the Messenger of Allah and Allah will never degrade me. Then ʿUmar went to Abu Bakr and told him the same as he had told the Prophet. On that Abu Bakr said (to ʿUmar). 'He is the Messenger of Allah and Allah will never degrade him.' Then Surat-al-Fath (i.e. Victory) was revealed and Messenger of Allah ﷺ recited it to the end in front of ʿUmar. On that ʿUmar asked, 'O Messenger of Allah ﷺ! Was it (i.e. the Hudaibiya Treaty) a victory?' Messenger of Allah ﷺ said, "Yes".  

أَيُّهَا النَّاسُ اتَّهِمُوا أَنْفُسَكُمْ فَإِنَّا كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ يَوْمَ الْحُدَيْبِيَةِ وَلَوْ نَرَى قِتَالاً لَقَاتَلْنَا فَجَاءَ عُمَرُ بْنُ الْخَطَّابِ فَقَالَ يَا رَسُولَ اللَّهِ أَلَسْنَا عَلَى الْحَقِّ وَهُمْ عَلَى الْبَاطِلِ فَقَالَ بَلَى فَقَالَ أَلَيْسَ قَتْلاَنَا فِي الْجَنَّةِ وَقَتْلاَهُمْ فِي النَّارِ قَالَ بَلَى قَالَ فَعَلَى مَا نُعْطِي الدَّنِيَّةَ فِي دِينِنَا أَنَرْجِعُ وَلَمَّا يَحْكُمِ اللَّهُ بَيْنَنَا وَبَيْنَهُمْ فَقَالَ ابْنَ الْخَطَّابِ إِنِّي رَسُولُ اللَّهِ وَلَنْ يُضَيِّعَنِي اللَّهُ أَبَدًا فَانْطَلَقَ عُمَرُ إِلَى أَبِي بَكْرٍ فَقَالَ لَهُ مِثْلَ مَا قَالَ لِلنَّبِيِّ ﷺ فَقَالَ إِنَّهُ رَسُولُ اللَّهِ وَلَنْ يُضَيِّعَهُ اللَّهُ أَبَدًا فَنَزَلَتْ سُورَةُ الْفَتْحِ فَقَرَأَهَا رَسُولُ اللَّهِ ﷺ عَلَى عُمَرَ إِلَى آخِرِهَا فَقَالَ عُمَرُ يَا رَسُولَ اللَّهِ أَوَفَتْحٌ هُوَ قَالَ نَعَمْ