Sayyiduna Buraydah (may Allah be pleased with him) narrates: We said: "O Messenger of Allah, we have come to know how to send salam upon you, so how should we send blessings (durud) upon you?" The narrator says: The Prophet (peace and blessings be upon him) said: "Say: 'O Allah, place Your blessings, Your mercy and Your bounties upon Sayyiduna Muhammad (peace and blessings be upon him) and upon the family of Sayyiduna Muhammad (peace and blessings be upon him), just as You placed them upon the family of Ibrahim. Indeed, You are Praiseworthy and the Possessor of glory.'"
Ahmad recorded it; its chain contains Abu Dawud al-A'ma (the blind), who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصلاة / 2869