Abu Dawud Book 2, Hadith Number 1092.
Chapter : Not known.
Narated By Abdullah ibn Mas’ud : When the Apostle of Allah (PBUH) addressed, he would say: Praise be to Allah, from Whom we seek help and pardon, and we seek refuge in Allah from the evils of our souls. He whom Allah guide has no one who can lead him astray, and he whom He leads astray has no one to guide him. And I bear witness that there is no god but Allah, and I bear witness that Muhammad is His servant and apostle. He sent him before the coming of the last hour with truth giving good tidings and warning. He who obeys Allah and His Apostle follows the right path; and he who disobeys them shall harm none except himself, and he will not harm Allah in the least.