'Aishah (May Allah be pleased with her) reported:
Messenger of Allah (ﷺ) said, "When Allah desires good for a ruler, He appoints for him a sincere adviser who will remind him if he forgets and helps him if he remembers. When Allah wishes for him the contrary, He appoints for him a bad adviser who will not remind him if he forgets, nor will he help him if he remembers."
Arabic/English book reference: Book 1, Hadith 679