Musnad Ahmad Hadith 4074

When we sat with The Messenger of Allah (ﷺ) in the prayer, we would say: Peace be upon Allah from His slaves, peace be upon So and so and So and so. Then the Messenger of Allah (ﷺ) said: “Do not say, peace be upon Allah, for Allah is as-Salam, But when one of you sits, let him say: "All compliments, prayers and pure words are due to Allah, Peace be upon you, O Prophet, and the mercy of Allah and His blessings. Peace be upon us, and on the righteous slaves of Allah' - for if you say that, it will reach every righteous slave between heaven and earth - ‘I bear witness that there is no god but Allah, and I bear witness that Muhammad is His slave and Messenger.’ Then let one of you choose whatever supplication he likes and call upon Allah with it.”