What did Prophet Muhammad (saw) pray for while he was digging the trench in the battle of Al-Khandaq?
 Narrated Sahl bin Sa`d As-Sa`idi:                     We were in the company of Allah's Apostle in (the battle of) Al-Khandaq, and he was digging the trench while we were carrying the earth away. He looked at us and said, "O Allah! There is no life worth living except the life of the Hereafter, so (please) forgive the Ansar and the Emigrants."