Principle number four...

Principle number four: Anything you are in doubt as to its being najis or not, as a result of coming into contact with some najis thing, you should not carry out any investigation, be it simple or not, to ensure it was tahir. You should assume that it is tahir. * Such as? - Suppose you were sure of your shirt being tahir. Now, some doubt lingers in your mind that it might not be the case.

Maybe, you think it might have been contaminated with urine, in which case, you need not carry out any investigation; for instance, you start looking for traces of urine on the shirt. You should assume that it is tahir. Previous…