"I asked Messenger of Allah (S) about smoothening the pebbles during Salat. He said: 'If you must do so, then let it be only once.'"
سَأَلْتُ رَسُولَ اللَّهِ ﷺ عَنْ مَسْحِ الْحَصَى فِي الصَّلاَةِ فَقَالَ إِنْ كُنْتَ لاَ بُدَّ فَاعِلاً فَمَرَّةً وَاحِدَةً