(4) باب السَّمْعِ وَالطَّاعَةِ لِلإِمَامِ مَا لَمْ تَكُنْ مَعْصِيَةً
Narrated Ibn `Abbas:
The Prophet (ﷺ) said, "If somebody sees his Muslim ruler doing something he disapproves of, he should be patient, for whoever becomes separate from the Muslim group even for a span and then dies, he will die as those who died in the Pre-lslamic period of ignorance (as rebellious sinners). (See Hadith No. 176 and 177)
Reference: Sahih al-Bukhari 7143
In-book reference: Book 93, Hadith 7
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 89, Hadith 257