Riyad as-Salihin

Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah (ﷺ) said, "Whosoever obeys me, obeys Allah; and he who disobeys me, disobeys Allah; and whosoever obeys the Amir (leader), in fact, obeys me; and he who disobeys the Amir, in fact, disobeys me."

[Al-Bukhari and Muslim].