From Sahih Muslim (Hadith 4747):
It has been narrated on the authority of Abu Huraira that the Holy prophet (ﷺ) said:Whoso obeys me obeys God, and whoso disobeys me disobeys God. Whoso obeys the commander (appointed by me) obeys me, and whoso disobeys the commander disobeys me. The same tradition transmitted by different persons omits the portion: And whose disobeys the commander disobeys me
Reference: Muslim 4747