´It was narrated that Abu Hurairah said:` The Messenger of Allah (ﷺ) said: “Whoever smoothes the pebbles, then he has engaged in Laghw.”* *Meaning he has done what is not suitable.
Hadith ReferenceSunan Ibn Majah / Establishing the Prayer and the Sunnah Regarding Them / Hadith: 1025
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم