Sahih Bukhari

Narrated `Abdullah:We used to pray behind the Prophet (ﷺ) and used to say: ""As-Salamu 'Al-Allah. The Prophet (ﷺ) said, ""Allah himself is As-Salam (Name of Allah), so you should say: 'at-Tahiyatu lil-lahi was-sala-watu wattaiyibatu, as-salamu `alaika aiyyuha-n-nabiyyu wa rahmatu-l-lahi wa barakatuhu, as-salamu `alaina wa `ala `ibadi-l-lahi as-salihin. Ashhadu an la ilaha il-lallah, wa ash-hadu anna Muhammadan `abduhu wa rasuluhu