What is the religious obligation of a Muslim when he sees wrongdoings in the markets and the like?

Question:
Honorable Shaykh, may Allah grant you success, this questioner says: What is the obligation of a Muslim when he sees wrongdoings in the markets and elsewhere?

Answer:
The obligation upon them is that the Messenger (peace and blessings be upon him) said: This is for those who have authority, those who possess power. If he cannot, meaning he has no authority, then with his tongue, through advice, reminding, and forbidding it with wisdom and goodly exhortation. Whoever cannot, let him deny it with his heart, and that is the weakest of faith." Yes. If he makes it so. This entire hadith indicates that it is necessary for the Muslim to deny the wrong, either by action, or by speech, or by the heart.