Issue 99: Earth and the things on/in it, like plants, building, and the building parts and materials are made pure by the sun provided that the conditions in the following issue are observed.

Issue 100: The sun is considered a purifier under the following conditions:

1- The impure thing must be wet so much as to wet the things in contact with it.

2- The sun must dry the impure thing by itself, that is, it must not be dried with the help of the wind for instance.

3- The sun must strike the impure thing directly not through things like clouds or curtains, unless, in the case of the clouds, they are so thin that they do not block out the sun.

4- If the original impurity is there, it must be removed before it is touched by the sun.

5- The sun must dry up the impure exterior and interior parts of a wall or earth all at once, so if the exterior is dried on one day and the interior is dried on the next day for instance, only the exterior will be pure and the interior will remain impure.

6- There must not be any air or any other pure thing between the exterior and interior of earth or a building which is struck by the sun.

Issue 101: When earth and the like are impure but not wet, if they are made wet with some water or anything else and then they are touched by the sun, they will be pure.