I head the Messenger of Allah ﷺ say: If any one you sees something objectionable, he should change it with his hand if he can change it with his hand. (The narrator Hammad broke the rest of the tradition which was completed by Ibn al-‘Ala’.) But if he cannot (do so), he should do it with his tongue, and if he cannot (do so with) his tongue he should do it in his heart, that being the weakest form of faith.
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ رَأَى مُنْكَرًا فَاسْتَطَاعَ أَنْ يُغَيِّرَهُ بِيَدِهِ فَلْيُغَيِّرْهُ بِيَدِهِ وَقَطَعَ هَنَّادٌ بَقِيَّةَ الْحَدِيثِ وَفَّاهُ ابْنُ الْعَلاَءِ فَإِنْ لَمْ يَسْتَطِعْ فَبِلِسَانِهِ فَإِنْ لَمْ يَسْتَطِعْ بِلِسَانِهِ فَبِقَلْبِهِ وَذَلِكَ أَضْعَفُ الإِيمَانِ