(1) (a) The place where a devotee prays must not be of illegally usurped property, (b) Prayers must be said on solid earth and not on something such as shifting sands, a haystack or waterbed that moves as one prays.
One should only pray in transit (on a train, plane, etc.) if it is not possible to do one’s prayer on solid ground. If it is necessary to do one’s prayer in transit, one must attempt to pray toward qiblah.
If the position of the vehicle changes during prayer, one must change his position accordingly so that he always faces toward qiblah.
(c) The place of sajdah must be tahir. Other sites of prayer should be tahir, but if they are not, they should not be so much wet that the wetness be transferable to the devotee.
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(d) At the time of sajdah the place where one puts his forehead must not be lower or higher than the height of four closed fingers from where his knees and toes are placed.
(2) The mosque
(a) It is haram to contaminate the floors, ceilings, roofs and interior walls of a mosque.
(b) If one knows that some part of a mosque has become najis, he must clean it immediately.
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(c) Saying prayers in a mosque has many virtues and a Muslim should go to the mosque whenever possible.
(1) It is recommended to keep a mosque well lit.
(2) It is recommended that a man going to the mosque wear perfume.
(3) All persons should wear clean and neat clothes and check to see that his shoes are not najis.
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(4) One should refrain from making the area dirty or from spitting or blowing one’s nose in the mosque.
(5) One should avoid sleeping in a mosque.
(6) One should pass his time worshipping with due attention to Allah and should refrain from disrespectful actions and nonsense.