حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا حَاتِمٌ، عَنْ يَزِيدَ بْنِ أَبِي عُبَيْدٍ، قَالَ قُلْتُ لِسَلَمَةَ بْنِ الأَكْوَعِ عَلَى أَىِّ شَىْءٍ بَايَعْتُمْ رَسُولَ اللَّهِ صلى الله عليه وسلم يَوْمَ الْحُدَيْبِيَةِ‏.‏ قَالَ عَلَى الْمَوْتِ‏.‏

Narrated Yazid bin Abi Ubaid: I said to Salama bin Al-Akwa`, "For what did you give the Pledge of allegiance to Allah's Messenger (PBUH) on the day of Al-Hudaibiya?" He replied, "For death (in the Cause of Islam.). Translation Not Available

Book Ref: Sahih Bukhari Book 64 Hadith 4169
Web Ref:  Sahih Bukhari Vol 5 Book 59 Hadith 487