Don’t say,”This is a believer,” or, “This is not a believer.” It might be on his last breath that one becomes believer. It might be you cursed someone who at the end of his life takes shahadah!

So adab is not to observe what others are doing, it is to observe yourself. Don’t observe others. Many people took shahadah and they died. What do you say about them? They are Muslims and they will be in Paradise, because Islam waives all your sins when you take shahadah.