Ash-hadu 'an lā 'ilāha 'illallāhuwaḥdahu lā sharīka lahuwa 'ash-hadu 'anna Muḥammadan `abduhu wa Rasūluhu.
I bear witness that none has the right to be worshipped but Allah alone, Who has no partner; and I bear witness that Muhammad is His slave and His Messenger.
Reference:
Muslim 1/209.
Hisnul Muslim 13
Muslim 1/209.
Hisnul Muslim 13