Muslim narrated in his Sahih that jabir bin Abdullah said, I heard the messenger of Allah say;
"Cover the pot and tie the knot of the water skin, for there is a day during the year in which a disease descends and falls in whatever pot that is not covered, or water skin, which is not tied, that it passes by."
This hadith contains a type of divine knowledge that the doctors could never reach on their own. Laith bin Sa'd, one of the narrators of this Hadith, said, "Non Muslims know which dai it is, in January, and they try to avoid its harm."
The Prophet commanded that the pots be covered, even with a branch, so that one makes covering it a habit. In addition, when one covers the pot to repel Satan and insects animals.
Drinking from the mouth of the water skin is not allowed.
Al bokhary narrated that Ibn Ab'ass said;
"The Messenger of Allah disallowed drinking from the mouth of the water skin."
There are many benefits in this Hadith. For instance, when one drinks from the tip or the mouth of the water skin, he will breathe in it and will give it an offensive odor. In addition, water may descend strongly and harm the stomach. In addition, there might be an insect in the water that one is unaware of, and that might harm him if he swallows it. In addition, water might be polluted with harmful substances that will enter the person's stomach while he is unaware. in addition, drinking from the mouth of the skin fill the stomach with air and thus the water will not have sufficient space.