If you are defiled , purify yourselves ; but if you are sick or on a journey , or if any of you comes from the privy , or you have touched women , and you can find no water , then have recourse to wholesome dust and wipe your faces and your hands with it . God does not desire to make any impediment for you ; but He desires to purify you , and that He may complete His blessing upon you ; haply you will be thankful .