walaikum salam, sayyiduna rasulallah `alaihi afDalus salatu was salam is reported to have said whoever among you sees an offensive or evil act, he must change it with his hand. If he cannot, then [he must change it] with his tongue. If he cannot, then [he must feel it] with his heart, and that is the weakest of iman (faith)” (Muslim).
I came across this and thought that this would be useful. sayyiduna rasulallah `alaihi afDalus salatu was salam is reported to have said " help your muslim brother when he is doing right and when he is doing wrong" the saHaba said : "what must we help him when he is doing wrong ?" the messenger of allah replied "yes especially when he is doing wrong, drag back his hand!" [meaning stop him from doing the wrong] .
