Narrated Abu Idris Al-Khawlani: "When 'Umar bin Al-Khattab removed 'Umair bin Sa'd as governor of Hims, he appointed Mu'awiyah. The people said: “He has removed 'Umair and appointed Mu'awiyah.' So 'Umair said: “Do not mention Mu'awiyah except with good, for indeed, I heard the Messenger of Allah (ﷺ) saying: "O Allah guide (others) by him””
Sahih LighairihiSahihDaifBook 49 · Hadith 243