What is the ruling on enjoining good and forbidding evil?

Question : The questioner says: Honorable Shaykh, if we leave the mosque and find many smokers and women displaying their adornment, but none of those present are forbidding it, and if everyone were to say "Fear Allah" to the smoker and others, it would be known that they are committing a wrong. So is there any advice for those present regarding enjoining good and forbidding evil? May Allah reward you with good.

Answer : In the name of Allah, the Most Gracious, the Most Merciful. Enjoining good and forbidding evil is a collective obligation. If a sufficient number of people perform it, the obligation falls off the rest, based on the saying of Allah the Exalted: So if one sees a wrong at the door of the mosque or inside the mosque, and no one stands up to forbid it, then it is obligatory for him to forbid it and clarify that it is invalid. As for changing it, changing a wrong is not for every person, but rather for the specific authorities designated for that purpose. So there is a difference between forbidding and commanding, and changing. Forbidding and commanding means enjoining good and forbidding evil, which is an obligatory collective obligation upon everyone. As for changing it, it is entrusted to specific authorities who are the ones who change it.