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Shiavault - a Vault of Shia Islamic Books A Code of Practice For Muslims in the West Taharat & Najasat: Ritual purity & impurity Introduction A Muslim tries to maintain the ritual purity of his body, clothes and everyday commodities by avoiding contact with impure things because such contacts would render the other items impure and would, therefore necessitate the process of purification.
Residing in a non-Muslim country makes the process of maintaining purity difficult for some Muslims as they deal with its non-Muslim citizens in various situations of their day-to-day life: in restaurants, cafes, barber's shops, laundrettes, and, in public baths and utilities, etc. Therefore, it is appropriate for me to clarify for the respected readers the religious rules concerning taharat (ritual purity) and najasat (ritual impurity).
General Rules A well known religious law says: "Everything is ritually pure for you unless you come to know that it is ritually impure." This law declares everything to be pure unless one becomes sure a particular item has become impure. And as long as you are not sure that it has become ritually impure (najis), it is to be considered pure and you can apply all the rules of purity to it without any hesitation or doubt.
The Ahlul Kitab (that is, the Jews, the Christians and the Zoroastrians) are ritually pure (tahir) as long as you do not know that they have become ritually impure (najis) by coming into contact with an impure object. You can follow this ruling when dealing with them. The impurity transfers from one item to another through flowing wetness [that is, there is so much wetness in the impure item that it permeates to another item and makes it impure].
The impurity is neither transferred when it is dry, nor is transferred by non-flowing wetness. So, if you place your hand on a dry najis item, your hand will not become impure. You can assume the ritual purity (taharat) of any person that you meet and shake hands with (even if that person's hand is wet) as long as you do not know his faith and religion - in such cases you can assume that he might be a Muslim or one of the Ahlul Kitab.
Moreover, it is not obligatory for you to ask him in order to ascertain his religion; that is, even if doing so does not put you or him in any inconvenience. (See the question-answer section below). Any water drops or other liquids that fall upon your body or dress are to be considered pure as long as you do not know that they are najis.