And 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 the leader has obeyed me, and whoever disobeys the leader has disobeyed me.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8134