Umm Salamah reported: The Messenger of Allah, peace and blessings be upon him, said, “There will be rulers from whom you will see both goodness and corruption. One who recognizes their evil and hates it will maintain his innocence, but one who is pleased with it and follows them will be sinful.” It was said, “Shall we not fight them?” The Prophet said, “No, as long as they pray.”
Source: Ṣaḥīḥ Muslim 1854
Grade: Sahih (authentic) according to Muslim
عَنْ أُمِّ سَلَمَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ سَتَكُونُ أُمَرَاءُ فَتَعْرِفُونَ وَتُنْكِرُونَ فَمَنْ عَرَفَ بَرِئَ وَمَنْ أَنْكَرَ سَلِمَ وَلَكِنْ مَنْ رَضِيَ وَتَابَعَ قَالُوا أَفَلَا نُقَاتِلُهُمْ قَالَ لَا مَا صَلَّوْا
1854 صحيح مسلم كتاب الإمارة باب وجوب الإنكار على الأمراء فيما يخالف الشرع وترك قتالهم ما صلوا ونحو ذلك