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 4823 in Maktaba Shamila
وحَدَّثَنَاه إِسْحَاقُ بْنُ إِبْرَاهِيمَ ، حَدَّثَنَا حَمَّادُ بْنُ مَسْعَدَةَ ، حَدَّثَنَا يَزِيدُ ، عَنْ سَلَمَةَ بِمِثْلِهِ .
The above tradition has also been handed down through a different chain of transmitters.
