Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)

Bukhari :: Book 5 :: Volume 59 :: Hadith 487

Narrated Yazid bin Abi Ubaid:

I said to Salama bin Al-Akwa, "For what did you give the Pledge of allegiance to Allah's Apostle on the day of Al-Hudaibiya?" He replied, "For death (in the Cause of Islam.)."