Sunan Ibn Majah Book 5, Hadith 101
“We said: ‘O Messenger
of Allah! We know what it means to send greetings upon you, but what
does it mean to send peace and blessings upon you?’ He said: ‘Say:
“Allahumma salli ‘ala Muhammadin ‘abdika wa Rasulika kama
salayta ‘ala Ibrahima, wa barik ‘ala Muhammad (wa ‘ala ali
Muhammadin) kama barakta ‘ala Ibrahima [O Allah, send Your grace,
honor and mercy upon Muhammad, Your slave and Messenger, as You sent
Your (grace, honour and mercy) upon Ibrahim, and send Your blessings
upon Muhammad (and the family of Muhammad) as You sent Your blessings
upon Ibrahim].”
“The Messenger of Allah (ﷺ) used to teach us the Tashah-hud as he used to teach us a Surah from the Qur’an: ‘Bismillahi wa Billahi; at-tahiyyatu lillahi was-salawatu wat-tayyibatu lillahi; as-salamu ‘alayka ayyuhan- Nabiyyu wa rahmatullahi wa barakatuhu; as-salamu ‘alayna wa ‘ala ‘ibadillahis-salihin. Ashhadu an la ilaha illallah wa ashhadu anna Muhammadan ‘abduhu wa rasuluhu. As’alu Allahal-jannah, wa a’udhu billahi minannar (In the name of Allah and by the grace of Allah. All compliments are due to Allah and all prayers and good words are due to Allah. Peace be upon you, O Prophet, and the mercy of Allah and His blessings; peace be upon us and upon the righteous slaves of Allah. I bear witness that none has the right to be worshipped but Allah and I bear witness that Muhammad is His slave and Messenger. I ask Allah for Paradise and I seek refuge with Allah from the Fire).’”
“I heard Ibn Abi Laila say: ‘Ka’b bin ‘Ujrah met me and said: “Shall I not give you a gift? The Messenger of Allah (ﷺ) came out to us and we said: ‘We know what it means to send greetings on you, but what does it mean to send peace and blessings upon you?’ He said: ‘Say: Allahumma salli ‘ala Muhammadin wa ‘ala ali Muhammadin, kama sallayta ‘ala Ibrahima, innaka Hamidun Majid; Allahumma barik ‘ala Muhammadin wa ‘ala ali Muhammadin, kama barakta ‘ala Ibrahima, innaka Hamidun Majid (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 Your blessings upon Muhammad and the family of Muhammad, as You sent Your blessings upon Ibrahim, You are indeed Praiseworthy, Most Glorious).’”