Sahih Muslim Book 2, Number 0458:
Abu Huraira reported Allah's Apostle (may peace be upon him) as saying: When anyone wipes himself with pebbles (after answering the call of nature) he must make use of an odd number and when any one of you performs ablution he must snuff in his nose water and then clean it.
1) The question that jumps out is - WHY???
a) Was Mohammad (Peace be upon him) a numerologist?
Numerology is any of many systems, traditions or beliefs in a mystical or esoteric relationship between numbers and physical objects or living things.
Numerology and numerological divination were popular among early mathematicians, such as Pythagoras, but are no longer considered part of mathematics and are regarded as pseudomathematics by modern scientists.This is similar to the historical development of astrology out of astronomy, and alchemy from chemistry.
Today, numerology is often not associated with numbers, but with the occult, alongside astrology and similar divinatory arts.
b) Did Mohammad (Peace be upon him) believe in magic? Did he like the occult?
As has already been discussed, Mohammad's (may peace be upon him) dad, Abdallah, was propositioned by a devil worshipping soothsayer http://muslimhadith.blogspot.com/2008/12/romantic-lines-to-say-when-making-love.html; Mohammad (may peace be upon him) would routinely practice in black magic http://muslimhadith.blogspot.com/2008/10/mohammad-witch-doctor-part-2-halloween.html; and had black magic practiced on him http://muslimhadith.blogspot.com/2008/05/volume-7-book-71-number-661-narrated.html; soothsayers would convert to Islam after seeing devils also convert to Islam http://muslimhadith.blogspot.com/2008/04/foreteller-converts-to-islam-after.html
c) Why did Mohammad (Peace be upon him) practice numerology after answering the call of nature?
As we already seen, Mohammad (Peace be upon him) discusses the Jinn (demonic spirits) after he answered the call of nature before - http://muslimhadith.blogspot.com/2008/05/animal-dung-is-food-of-jinns.html
2) Why don't more Muslims clean themselves with pebbles in order to faithfully immitate holy Prophet Mohammad (peace be upon him)?
a) Could entrepreneuring business- Muslims create pebbles for Muslims to use after one answer's the call of nature?
b) There are potentially over 1.2 billion customers for these pebbles - It would be able to put all toilet paper companies out of business in the Islamic Umma (one less western business company)
3) Could Muslims find the exact pebbles that Mohammad (peace be upon him) used to clean himself after he answered the call of nature, and reuse those same pebbles to clean themselves too?
a) After all, as we have seen in several instances, the followers of Mohammad (peace be unto him) the first Muslims would smear and reuse Mohammad's ablution water:
ii) See question 1 of http://muslimhadith.blogspot.com/2009/01/mohammad-may-peace-be-upon-him-created.html
b) In fact, Egyptian Mufti Dr. Ali Gum'a wrote a book in which he claimed that the companions of the Prophet Muhammad (peace be unto him) would drink his urine to be blessed.
i)Dr. Ali Gum’a wrote that the companions of the Prophet Muhammad would blessthemselves by drinking his urine, and described an incident of urine-drinkingfrom a hadith:“Umm Ayman drank the urine of the Prophet, and the prophet toldher:‘This stomach will not be dragged through the fire of Hell, because itcontains something of our Lord the Messenger of Allah...’”
This blessing,“ Al-Gum’a added,”[can also] be done with thehonorable saliva, sweat, hair, urine or blood of the Prophet. This is becauseanyone who knows the love of the Messenger of Allah is not repulsed [by these];just as a mother is not repulsed by the feces of her son, this is even more so[in the case of] our Lord the Messenger of Allah, whom we love more than ourfathers, sons, and wives. Anyone who was or is repulsed by the Messenger ofAllah must recant his faith."
Continuing Gum’a fatwa:”The entire body of the Prophet, whether exposed or hidden, ispure, and there is nothing in it– including his secretions – that [can] repulseanyone. His sweat smelled better than perfume. Umm Haram would collect thissweat and distribute it to the people of Al-Madina.“
Dr. Gum’a added: "The hadith of Suhail bin Omar at Al-Hudaybiyasays:‘Oh Lord, I was with Kisra [the ruler of Persia] and with Kaisar [theruler of Byzantium] and I saw no instance in which the leader was glorified likethe Companions of the Prophet glorified Muhammad. The second Muhammad spat, one of them would immediately hasten [to grab his saliva] and smear it upon hisface.’ Hence, the ulema, including Ibn Hajar Al-Askalani, Al-Baihaqi,Al-Daraqutni and Al-Haythami, determined that the Prophet’s entire body waspure."
Just imagine the blessings a Muslim would receive in reusing the very stones Mohammad (Peace be upon him) used to wipe himself with!