(12) باب كَرَاهَةِ مَسْحِ الْحَصَى وَتَسْوِيَةِ التُّرَابِ فِي الصَّلاَةِ
Mu'aiqib quoted the Messenger of Allah (ﷺ) mentioning the removal of pebbles from the ground where he prostrated himself. He (the Prophet) said:
It you must do so, do it only once.
Reference: Sahih Muslim 546 a
In-book reference: Book 5, Hadith 59
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1114