Sunan Ibn Majah Book 5, Hadith 104

“When you send peace and blessings upon the Messenger of Allah (ﷺ), then do it well, for you do not know, that may be shown to him.” They said to him: “Teach us.” He said: “Say: ‘Allahumma aj’al salataka wa rahmataka wa barakatika ‘ala sayyidil-mursalin wa imamil-muttaqin wa khatamin- nabiyyin, Muhammad ‘abdika wa Rasulika imamil-khayri (wa qa’idil- khair), wa Rasulir-Rahmah. Allahummab’athhu maqaman mahmudan yaghbituhu bihil-awwaluna wal-akhirun. Allahumma salli ‘ala Muhammadin wa ‘ala ali Muhammadin kama sallayta ‘ala Ibrahim wa ‘ala ali Ibrahim; Allahumma barik ‘ala Muhammadin wa ‘ala ali Muhammadin kama barakta ‘ala Ibrahim wa ‘ala ali Ibrahim, innaka Hamidum Majid (O Allah, send Your grace, honour, mercy and blessings upon the leader of the Messengers, the imam of the pious and the seal of the Prophets, Muhammad, Your slave and Messenger, the Imam of the good (and the leader) of the good, and the Messenger of mercy. O Allah, raise him to a station of praise and glory that will be the envy of the first and the last. O Allah, send Your grace, honour and mercy upon Muhammad and upon the family of Muhammad, as You sent Your grace, honour and mercy upon Ibrahim, You are indeed Praiseworthy, Most Glorious. O Allah, send blessings upon Muhammad and upon the family of Muhammad as You sent blessings upon Ibrahim and the family of Ibrahim, You are Praiseworthy, Most Glorious).’”