Sahih Bukhari Volume 4, Book 56, Hadith 2959

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا جُوَيْرِيَةُ، عَنْ نَافِعٍ، قَالَ قَالَ ابْنُ عُمَرَ ـ رضى الله عنهما ـ رَجَعْنَا مِنَ الْعَامِ الْمُقْبِلِ فَمَا اجْتَمَعَ مِنَّا اثْنَانِ عَلَى الشَّجَرَةِ الَّتِي بَايَعْنَا تَحْتَهَا، كَانَتْ رَحْمَةً مِنَ اللَّهِ‏.‏ فَسَأَلْتُ نَافِعًا عَلَى أَىِّ شَىْءٍ بَايَعَهُمْ عَلَى الْمَوْتِ قَالَ لاَ، بَايَعَهُمْ عَلَى الصَّبْرِ‏.

Narrated By Ibn 'Umar : When we reached (Hudaibiya) in the next year (of the treaty of Hudaibiya), not even two men amongst us agreed unanimously as to which was the tree under which we had given the pledge of allegiance, and that was out of Allah's Mercy. (The sub narrator asked Naf'i, "For what did the Prophet take their pledge of allegiance, was it for death?" Naf'i replied "No, but he took their pledge of allegiance for patience.")