It wasnarrated that Mu'aiqib said:
"The Messenger of Allah (ﷺ)said,concerning smoothing the pebbles during prayer: 'If you must dothat, then do it only once.'" (JA)
English reference (JA): Vol. 1, Book 5, Hadith 1026 (JA)
Arabic reference (JA): Book 5, Hadith 1079 (JA)