Mishkat al-Masabih #923
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ مُعَيْقِيبٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي الرَّجُلِ يُسَوِّي التُّرَابَ حَيْثُ يَسْجُدُ؟ قَالَ: «إِنْ كُنْتَ فَاعِلًا فَوَاحِدَةً»
Mu'aiqib quoted the Prohpet as saying about a man who smoothed the ground where he prostrated himself, “If you do it, do it only once.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #923 from Mishkat al-Masabih, in the Book of Prayer.