Sahih Bukhari | Volume 9 | Hadith Number 478

Narrated by 'Abdullah
We used to pray behind the Prophet and used to say: "As-Salamu 'Al-Allah. The Prophet said, "Allah himself is As-Salam (Name of Allah), so you should say: 'At-Tahiyatu lil- laihi was- sala-watu wat-taiyibatu, as-sallamu 'Alayka aiyuha-n-nabiyyu wa rahrmatu-l- lahi wa barak-atuhu, As-salamu 'alaina wa 'ala 'ibaldi-l-lahi as-salihin. Ashhadu an la ilaha il-lallah, wa ash-hadu anna Muhammadan 'abduhu wa rasuluhu.'"