"The Messenger of Allah said: 'Religion is sincerity (An-Nasihah).' They said: 'To whom, O Messenger of Allah?' he said: 'To Allah, to His Book, to His Messenger, to the imams of the Muslims, and to their common folk."' (Using translation from Nasāʾī 4197)
أَنَا سَمِعْتُهُ مِنَ الَّذِي حَدَّثَ بِهِ أَبِي حَدَّثَنِيهِ رَجُلٌ مِنْ أَهْلِ الشَّامِ يُقَالُ لَهُ عَطَاءُ بْنُ يَزِيدَ عَنْ تَمِيمٍ الدَّارِيِّ قَالَ قَالَ رَسُولُ اللهِ ﷺ «إِنَّ الدِّينَ النَّصِيحَةُ إِنَّ الدِّينَ النَّصِيحَةُ» قَالُوا لِمَنْ يَا رَسُولَ اللهِ؟ قَالَ «لِلَّهِ وَلِكِتَابِهِ وَنَبِيِّهِ وَلِأَئِمَّةِ الْمُسْلِمِينَ»