It was asked ‘O Allah’s Apostle! We know how to greet you; but how to send ‘Salat’ upon you?

He said, ‘Say: Allahumma Salli ala Muhammadin wa ‘ala Ali Muhammadin, kama sal-laita ‘ala all Ibrahima innaka Hamidun Majid. Allahumma barik ‘ala Muhammadin wa ‘ala all Muhammadin, kama barakta ‘ala all Ibrahima, innaka Hamidun Majid.”

[Bukhari Book:75 No:368]