On the day of Al-Hudaibiya, Messenger of Allah ﷺ said to us' "You are the best people on the earth!" We were 1400 then. If I could see now, I would have shown you the place of the Tree (beneath which we gave the Pledge of Allegiance)." Salim said, "Our number was 1400."  

لَنَا رَسُولُ اللَّهِ ﷺ يَوْمَ الْحُدَيْبِيَةِ أَنْتُمْ خَيْرُ أَهْلِ الأَرْضِ وَكُنَّا أَلْفًا وَأَرْبَعَمِائَةٍ وَلَوْ كُنْتُ أُبْصِرُ الْيَوْمَ لأَرَيْتُكُمْ مَكَانَ الشَّجَرَةِ  

That his father said, "I saw the Tree (of the Ar-Ridwan Pledge of allegiance and when I returned to it later, I was not able to recognize it. (The sub--narrator MahmiJd said, Al-Musaiyab said, 'Then; forgot it (i.e., the Tree).)"  

لَقَدْ رَأَيْتُ الشَّجَرَةَ ثُمَّ أَتَيْتُهَا بَعْدُ فَلَمْ أَعْرِفْهَا قَالَ مَحْمُودٌ ثُمَّ أُنْسِيتُهَا بَعْدُ  

I said to Salama bin Al-Akwaʿ, "For what did you give the Pledge of allegiance to Messenger of Allah ﷺ on the day of Al-Hudaibiya?" He replied, "For death (in the Cause of Islam.).  

قُلْتُ لِسَلَمَةَ بْنِ الأَكْوَعِ عَلَى أَىِّ شَىْءٍ بَايَعْتُمْ رَسُولَ اللَّهِ ﷺ يَوْمَ الْحُدَيْبِيَةِ قَالَ عَلَى الْمَوْتِ  

that in the time (of the battle) of Al-Harra a person came to him and said, "Ibn Hanzala is taking the pledge of allegiance from the people for death." He said, "I will never give a pledge of allegiance for such a thing to anyone after Messenger of Allah ﷺ."  

لَمَّا كَانَ زَمَنَ الْحَرَّةِ أَتَاهُ آتٍ فَقَالَ لَهُ إِنَّ ابْنَ حَنْظَلَةَ يُبَايِعُ النَّاسَ عَلَى الْمَوْتِ فَقَالَ لاَ أُبَايِعُ عَلَى هَذَا أَحَدًا بَعْدَ رَسُولِ اللَّهِ ﷺ