Musannaf Ibn Abi Shaybah

Hazrat Talha says that we asked, "O Messenger of Allah! We have learned the way to send salutations upon you; now teach us the way to send blessings (Durood) upon you." The Prophet (peace and blessings be upon him and his family) said, "Say these words: O Allah, send mercy upon Muhammad (peace be upon him and his family) 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 Muhammad (peace be upon him and his family) and upon his family as You sent blessings upon Ibrahim and upon his family. Surely, You are Praiseworthy and Glorious."