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Narrated 'Abdullah: The Prophet (sallAllaahu 'alayhi wa sallam) went out to answer the call of nature and asked me to bring three stones. I found two stones and searched for the third but could not find it. So I took a dried piece of dung and brought it to him. He took the two stones and threw away the dung and said, "This is a filthy thing." Narrated Abu Huraira: The Prophet (sallAllaahu 'alayhi wa sallam) said, "Whoever performs ablution should clean his nose with water by putting the water in it and then blowing it out, and whoever cleans his private parts with stones should do it with odd number of stones." Narrated Abu Huraira: I followed the Prophet (sallAllaahu 'alayhi wa sallam) while he was going out to answer the call of nature. He used not to look this way or that. So, when I approached near him he said to me, "Fetch for me some stones for ' cleaning the privates parts (or said something similar), and do not bring a bone or a piece of dung." So I brought the stones in the corner of my garment and placed them by his side and I then went away from him. When he finished (from answering the call of nature) he used them. Sources: Bukhari, in The Book of Wudu Abu Huraira reported Allaah's Prophet (sallAllaahu 'alayhi wa sallam) 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. Source: Muslim, in The Book of Purification