It you must do so, do it only once.
Sahih Muslim Book 5, Hadith 59
← Previous Hadith The Messenger of Allah (ﷺ) forbade to do so.

Sahih Muslim Book 5, Hadith 58 Next Hadith → They asked the Apostle (ﷺ) about the removal of (pebbles) in prayer, whereupon he said: If you do it, do it only once.

Sahih Muslim Book 5, Hadith 60