Book 39, Hadith 60

It was narrated that Kab bin Ujrah said:"The Messenger of Allah came out to us and we were nine, fie and four, some 'Arabs and some non- 'Arabs. He said: 'Listen. Have you heard that after me there will be rulers, whoever enters upon them and believes their lies and help them in their wrongdoing is not of me, and I am not of him, and he will not come to me at the Cistern? Whoever does not enter upon them or belive their lies or help them in their wrongdoing is of me and I am of him, and he will come to me at the Cistern