Musannaf Ibn Abi Shaybah

Hazrat Uqbah bin Amr narrates that once a man came to the service of the Holy Prophet (peace and blessings be upon him) and, sitting before him, said: "O Messenger of Allah! We have learned how to send salutations upon you; please tell us how we should send blessings (durood) upon you?" The Prophet remained silent for a while, until we wished in our hearts that he had not asked this question. Then the Prophet said: "When you send blessings, say: O Allah, send mercy upon the unlettered Prophet Muhammad (peace and blessings be upon him) and upon his family, as You sent mercy upon Ibrahim and upon his family. Surely, You are Praiseworthy and Glorious. O Allah, send blessings upon the unlettered Prophet Muhammad (peace and blessings be upon him) and upon his family, as You sent blessings upon Ibrahim and upon his family. Surely, You are Praiseworthy and Glorious."