From the route of Abu Najih al-^Irbad bin Sariyah, may Allah accept his deeds, who said: The Messenger of Allah, sallallahu ^alayhi wa sallam, preached us a far-reaching preach that alerted the hearts and made our eyes shed tears. We said: O Messenger of Allah, as if this is a farewell preach, so advise us.
The Prophet said, << I advise you to be pious to Allah. Listen to the rules and obey the rules even if a Habashiyy (Abyssinian) slave was to rule over you. The one among you who shall live long enough shall witness many differences, so adhere to my creed and the creed of the rightly guided Caliphs after me and cling to it with your canine teeth. Be ware of Innovations, because most Innovations belong to misguidance.>>
Narrated by Abu Dawud and at-Tirmidhiyy and he said the Hadith is Hasan Sahih.