Sahih Bukhari Volume 004, Book 056, Hadith Number 683.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 56. Virtues and Merits of the Prophets (PBUH) and his Companions
Narated By 'Abdullah : As if I saw the Prophet talking about one of the prophets whose nation had beaten him and caused him to bleed, while he was cleaning the blood off his face and saying, "O Allah! Forgive my nation, for they have no knowledge."