"Mu'aiqib told me that the Messenger of Allah ﷺ said: 'If you have to do that, then do it only once.'"
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِنْ كُنْتَ لاَ بُدَّ فَاعِلاً فَمَرَّةً
ذِكْرُ الْبَيَانِ بِأَنَّ هَذَا الْفِعْلَ الْمَزْجُورَ عَنْهُ فِي الصَّلَاةِ قَدْ أُبِيحَ بَعْضُهُ لِلضَّرُورَةِ
"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.'" (Using translation from Tirmidhī 380)
سَأَلْتُ رَسُولَ اللَّهِ ﷺ عَنْ مَسِّ الْحَصَى فِي الصَّلَاةِ فَقَالَ «إِنْ كُنْتَ لَا بُدَّ فَاعِلًا فَمَرَّةً»
[Machine] The Messenger of Allah ﷺ said, "If you do it, do it once," meaning wiping off the pebbles.
قَالَ رَسُولُ اللهِ ﷺ «إِنْ كُنْتَ فَاعِلًا فَمَرَّةً» يَعْنِي مَسْحَ الْحَصَى
"Mu'aiqib told me that the Messenger of Allah ﷺ said: 'If you have to do that, then do it only once.'" (Using translation from Nasāʾī 1192)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِنَّ كُنْتَ فَاعِلًا فَمَرَّةً»
"Mu'aiqib told me that the Messenger of Allah ﷺ said: 'If you have to do that, then do it only once.'" (Using translation from Nasāʾī 1192)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِنْ كُنْتَ فَاعِلًا فَمَرَّةً»
Request/Fix translation
"إِنْ كُنْتَ لَابُدَّ فَاعلًا فَمَرَّةً وَاحدَةً" .