Just like Amr bil Ma’ruf there must be some hope that the advice will be followed by the one who is doing something haram. Nahyi anil Munkar is wajib the first time and mustahab the second.
Nahyi anil Munkar is done in four stages:
- First by facial expression showing dislike of the deed which is haram.
- By words of advice.
- Warnings or angry words.
- By use of physical action to stop the haram act provided one does not get hurt in the process.