It was narrated that ‘Abdullah (رضي الله عنه) said that

The Messenger of Allah (ﷺ) taught him the tashahhud and instructed him to teach the people, "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. I bear witness that none has the right to be worshipped except Allah, and I bear witness that Muhammad is His slave and Messenger.”