مَنْ رَأَى مِنْكُمْ مُنْكَرًا، فَلْيُغَيِّرْهُ بِيَدِهِ، فَإِنْ لَمْ يَسْتَطِعْ، فَبِلِسَانِهِ، فَإِنْ لَمْ يَسْتَطِعْ، فَبِقَلْبِهِ، وَذَلِكَ أَضْعَفُ الْإِيمَانِ
Translation: Whoever among you sees a wrong should change it by hand; if unable, then by speech; if unable even to do that, then by the heart, and that is the weakest degree of faith.
Source: مسلم
رَأَى means “saw,” and مُنْكَرًا means an objectionable wrong. فَلْيُغَيِّرْهُ uses the imperative lām to direct change. The repeated phrase فَإِنْ لَمْ يَسْتَطِعْ means “if unable,” leading to the next possible response. بِيَدِهِ، بِلِسَانِهِ، بِقَلْبِهِ sets out the order of methods.
Responding to wrong requires knowledge, legitimate authority, wisdom, and attention to consequences. “By hand” does not authorize every individual to punish or coerce others; any action must stay within appropriate religious and legal limits. Correction should not produce a greater harm.