661. If a person searched for water before the time for Namaz, but did not find it and if he stayed there till the time of prayers set in, he should search for water again, as a recommended precaution, provided he feels that water may be found.
662. If a person searched for water after the time for Namaz had set in, and did not find it, if he stayed there till the time for next prayers, and if he felt there was a possibility of water being found, the recommended precaution is that he should go in search of water again.
663. When the time left for prayers is short or when there is fear of thieves or wild beasts or when the search for water is unbearable, it is not necessary for one to search for water.
664. If a person does not search for water till the time for Namaz approaches Qadha, in spite of the fact that he would have found water if he had tried, such a person has committed a sin, but the namaz which he will pray with tayammum will be valid.
665. If a person is sure that he cannot get water and does not, therefore, go in search of water and offers his prayers with tayammum, but realises after prayers that if he had made an effort he would have fetched water, he should, as an obligatory precaution, do wudhu and repeat the prayers.
666. If a person could not get water after a search and prayed with tayammum and then learns later after offering prayers that water was available at the place where he had searched, his prayers is valid.
667. If a person believed that the time left for prayers was little, and prayed with tayammum without going in search of water, but later learnt after the prayers but before the expiry of time that there was time for a search of water, then the obligatory precaution is that he should repeat that prayer.
668. If the time for Namaz has set in and a person is already with Wudhu, he should not allow his Wudhu to become void if he knows that he will not be able to find water or he will not be able to do Wudhu again. As an obligatory precaution, he should not invalidate his Wudhu deliberately. However, a man can have sex with his wife even if he knows that he will not be able to do Ghusl.
669. Similarly, if a person is with Wudhu before the time for prayers set in, and knew that if he made his Wudhu void, it would not be possible for him to get water, the recommended precaution is that he should try to keep his Wudhu intact. As an obligatory precaution, he should not invalidate the Wudhu deliberately.
670. If a person has just sufficient water for Wudhu or for Ghusl, and if he knows that if he spills it he will not be able to get water again, it is haraam for him to spill it if the time for prayers has already set in, and the obligatory precaution is that he should not throw it away even before the time for prayers sets in.