The Book of Prayers (Kitab Al-Salat) 
Muslim :: Book 4 : Hadith 1115
Mu'aiqib said: They asked the Apostle (may peace be upon him) about the removal of (pebbles) in prayer, whereupon he said: If you do it, do it only once.
The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1115
Mu'aiqib said: They asked the Apostle (may peace be upon him) about the removal of (pebbles) in prayer, whereupon he said: If you do it, do it only once.