Islamic law collects the best of everything, so its rules are in harmony with pure human nature, including rules caring about internal and external human cleanliness. In this hadith, the Prophet (ﷺ) mentioned ten matters of pure original nature with which all people were given birth. They are: (1) Trimming the mustache: A Muslim should trim the hair growing on the upper lip, as Ibn Omar narrated in the Two Sahihs that the Prophet said, "Do the opposite of what the polytheists do. Let the beard grow long and clip the mustache," (2) Letting the beard grow: It is to let the hair of chin and cheeks grow without trimming it, (3) Using siwak (tooth-stick): It is a stick cut from arak tree which is used to clean and freshen the mouth and teeth, and remove unpleasant odors, (4) Rinsing the nose: It is to sniff water into the nose then blow it out to remove any dirt or filth, (5) Trimming fingers’ and toes’ nails: It is to trim them before exceeding forty days, for they contain dirties that may harm a person, as Anas narrated in Sahih Muslim, (6) Washing the knuckles: It is to wash any dirties that they may collect, (7) Plucking the armpit hairs: Plucking is better if one bears it but if a person removes it by any means, he follows the Prophetic tradition as well, (8) Shaving the pubic hair: It is to remove the hair growing around male’s or female’s private parts, (9) Washing one's private parts after relieving himself, and (10) Rinsing the mouth: It is to cleanse one’s mouth then spit out the water, especially after eating or eating something with unpleasant smell. Moreover, Abu Hurairah narrated in the Two Sahihs that the Prophet (ﷺ) mentioned circumcision as a matter of pure human nature. It is to cut the foreskin from a baby's penis or the top of the piece of skin that looks like a rooster’s comb from a female baby’s gentile. Finally, there is no doubt that these matters are related to religious and worldly benefits, such as improving one’s appearance, cleansing the body generally and in detail, having keenness on purification, kindly keeping people away from any unpleasant smells that may harm them, and avoiding the practices of the disbelievers like Magus, Jews, and Christians..