Sahih Muslim
The Book on Government (Kitab Al-Imara)
Book Number: 020 / Hadith Number: 4519
It has been narrated on the authority of Abu Huraira that the Messenger of Allah (may peace be upon him) said: Whoso obeys me obeys God; and whose disobeys me disobeys God. Whoso obeys my commander obeys me, and whoso disobeys my commander disobeys me.