صَحِيحُ مُسْلِمٍ
Sahih Muslim 1856 b
The Book on Government
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
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا ابْنُ عُيَيْنَةَ، ح وَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ لَمْ نُبَايِعْ رَسُولَ اللَّهِ صلى الله عليه وسلم عَلَى الْمَوْتِ إِنَّمَا بَايَعْنَاهُ عَلَى أَنْ لاَ نَفِرَّ .
It has been narrated (through a different chain of transmitters) on the authority of Jabir who said: While swearing fealty to the Prophet (ﷺ) we did not take the oath to death but that we would not run away (from the battlefield).
Sahih Muslim, 1856 bSahihصحيح