Jami` at-Tirmidhi 483

Ka'b bin Ujrah narrated:"We said: 'O Messenger of Allah! We have learned about saying the Salam to you, but how about As-Salat upon you?' He said: 'Say: (Allahumma salli ala Muhammadin Wa Ala ali Muhammadin kama sallaita Ala Ibrahim, Innaka hamidan MAjid, Wa barik Ala Muhammadin wa Ala ali Muhammadin kamma barakta Ala Ibrahim Innaka Hamidan Majid)" O Allah! Send Salat upon Muhammad and upon Muhammad's family just as You have sent Salat upon Ibrahim, indeed You are the Praise and Majestic. And send blessings upon Muhammad and Muhammad's family just as You have sent blessing upon Ibrahim, indeed You are the Praised and Majestic.'Mahmud said: "Abu Usamah said: Za'idah added something for me, from Al-Amash, from Al-Hakam, from Abdur-Rahman bin Abi Laila, that he said: "We would say 'And upon us along with them