Sahih Muslim Book - 33, Hadith - 4807

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا لَيْثُ بْنُ سَعْدٍ ح وَحَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ أَخْبَرَنَا اللَّيْثُ عَنْ أَبِى الزُّبَيْرِ عَنْ جَابِرٍ قَالَ كُنَّا يَوْمَ الْحُدَيْبِيَةِ أَلْفًا وَأَرْبَعَمِائَةٍ فَبَايَعْنَاهُ وَعُمَرُ آخِذٌ بِيَدِهِ تَحْتَ الشَّجَرَةِ وَهِىَ سَمُرَةٌ. وَقَالَ بَايَعْنَاهُ عَلَى أَلاَ نَفِرَّ. وَلَمْ نُبَايِعْهُ عَلَى الْمَوْتِ.

It was narrated that Jabir said: "On the day of Al-Hudaibiyah we were fourteen hundred, and we swore allegiance to him (s.a.w) while 'Umar was holding his hand beneath the tree, which was an acacia. And we swore allegiance, pledging not to flee (from battle) but we did not swear to fight to the death."