It was narrated that Ibn 'Abbas said

"The Messenger of Allah (ﷺ) used to teach us the tashahhud as he taught us the Quran, and he used to say: : 'At-tahiyyatu lillahi was-salawatu wat-tayyibat, as-salamu 'alaika ayyuhan-Nabiyyu wa rahmatAllahi wa barakatuhu. As-salamu 'alaina wa 'ala 'ibad illahis-salihin, ash-hadu an la ilaha ill-Allah wa ash-hadu anna Muhammad an 'abduhu wa rasuluhu (All compliments, prayers and pure words are due to Allah. Peace be upon you, O Prophet, and the mercy of Allah ﷻ and his blessings. Peace be upon us and upon the righteous slaves of Allah ﷻ. I bear witness that none has the right to be worshipped except Allah and I bear witness that Muhammad is His slave and Messenger).'