Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 683
Narrated '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."