It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever obeys me has indeed obeyed Allah, and whoever disobeys me has disobeyed Allah. Whoever obeys my leader has obeyed me, and whoever disobeys my leader has disobeyed me.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 10637