Sunan Ibn Majah — Establishing the Prayer and the Sunnah Regarding Them — Hadith No: 905
Translation
It was narrated from Abu Humaid As-Sa’di that they said:“O Messenger of Allah! We have been commanded to send peace and blessings upon you. How should we send peace and blessings upon you?” He said: “Say: Allahumma salli ‘ala Muhammadin wa azwajihi wa dhurriyatihi, kama sallayta ‘ala Ibrahim; wa barik ‘ala Muhammadin wa azwajihi wa dhurriyatihi kama barakta ‘ala ali Ibrahim fil-‘alamin, innaka Hamidum Majid (O Allah, send Your grace, honour and mercy upon Muhammad and his wives and offspring, as You sent Your grace, honour and mercy upon Ibrahim. O Allah, send Your blessings upon Muhammad and his wives and offspring, as You sent Your blessings upon the family of Ibrahim among the nations, You are indeed Praiseworthy, Most Glorious).”