Hadith #1121 (Sahih Muslim)
Book: The Book of Mosques and Places of Prayer
Narrator(s): Mu'aiqib
Grade: Sahih

It you must do so, do it only once.

Source: https://parallelquran.com/hadith/sahih-muslim-1121/

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Hadith #1122 (Sahih Muslim)
Book: The Book of Mosques and Places of Prayer
Narrator(s): Mu'aiqib
Grade: Sahih

They asked the Apostle (ﷺ) about the removal of (pebbles) in prayer, whereupon he said: If you do it, do it only once.

Source: https://parallelquran.com/hadith/sahih-muslim-1122/