صحيح مسلم
Sahih Muslim
كتاب الإمارة
The Book on Government
باب اسْتِحْبَابِ مُبَايَعَةِ الإِمَامِ الْجَيْشَ عِنْدَ إِرَادَةِ الْقِتَالِ وَبَيَانِ بَيْعَةِ الرِّضْوَانِ تَحْتَ الشَّجَرَةِ:
Chapter: It is recommended for the army to swear allegiance to the ruler when intending to fight, and an account of Bay'at Ar-Ridwan beneath the tree
Hadith 1860
This hadith is listed as number 4822 in Maktaba Shamila
وحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ ، حَدَّثَنَا حَاتِمٌ يَعْنِي ابْنَ إِسْمَاعِيلَ ، عَنْ يَزِيدَ بْنِ أَبِي عُبَيْدٍ مَوْلَى سَلَمَةَ بْنِ الْأَكْوَعِ ، قَالَ : قُلْتُ لِسَلَمَةَ : " عَلَى أَيِّ شَيْءٍ بَايَعْتُمْ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَوْمَ الْحُدَيْبِيَةِ ؟ ، قَالَ : عَلَى الْمَوْتِ " .
It has been narrated on the authority of Yazid bin Abu Ubaid (the freed slave of Salama bin al-Akwa') who said: 1 asked Salama as to what effect he had sworn fealty to the Messenger of Allah (ﷺ) on the Day of Hudaibiya. He said: To the effect that we will die fighting.
