It wasnarrated that Hakam said:
"I heard Ibn Abi Laila say: 'Ka'bbin'Ujrah met me and said: "Shall I not give you a gift? TheMessenger of Allah (ﷺ) came out to us and we said: 'We know whatitmeans to send greetings on you, but what does it mean to sendpeaceand blessings upon you?' He said: 'Say: Allahumma salli'alaMuhammadin wa 'ala ali Muhammadin, kama sallayta 'alaIbrahima, innakaHamidun Majid; Allahumma barik 'ala Muhammadin wa'ala ali Muhammadin, kama barakta 'ala Ibrahima,innaka Hamidun Majid (O Allah, send your grace,honour and mercy uponMuhammad and upon the family of Muhammad, asYou sent Your grace,honour and mercy upon Ibrahim, You are indeedPraiseworthy, MostGlorious. O Allah, send Your blessings uponMuhammad and the family ofMuhammad, as You sent Your blessings uponIbrahim, You are indeedPraiseworthy, Most Glorious).'"
English reference: Vol. 1, Book 5, Hadith 904
Arabic reference: Book 5, Hadith 957