193. The sun makes the earth, building, and things like door and window which used in buildings Pak, provided that the following six conditions are fulfilled:
a) The Najis thing should be wet, and if it is dry, it should be made wet so that the sun dries it up.
b) If the original Nejasat is present on that thing, it should be removed from it before it is dried by the sun.
c) Nothing should intervene between the Najis thing and the sun. Therefore, if the rays fall on the Najis thing from behind a curtain etc., or a cloud, and makes it dry, the thing will not become Pak. But there is no harm if the cloud is so thin that it does not serve as an impediment between the Najis thing and the sun.
d) Only the sun should make the Najis thing dry. So, if a Najis thing is jointly dried by the wind and the sun, it will not become Pak. However, it would not matter if the wind blows lightly, and it may not be said that it has had any share in making the Najis thing dry.
e) The sun should dry up the whole Najis parts of the building all at once. If the sun dries the surface of the Najis earth or building, first, and later on dries the inner part, only the surface will become Pak, and the inner portion will remain Najis.
f) There should not be any gap between the surface of ground or the building which is under the sun and their interior, because of air or some other Pak thing.
194. A Najis mat will be made Pak by the sun. Also, the sun makes trees and the grass Pak.
195. If the sun shines on Najis earth, and one doubts later whether the earth was wet or not at that time, or whether the wetness dried up because of the sunshine or not, the earth will remain Najis. Similarly, if one doubts whether original Nejasat had been removed from the earth before sunshine, or whether there was any impediment preventing direct sunshine, the earth will remain Najis.
196. If the sun shines on one side of a Najis wall, the other side which the sun does not shine on it, will not become Pak. But if the wall is so narrow that the other side of the wall also dries as a consequence of shining on the first side, then both dies will be Pak.