[Machine] The Prophet mentioned wiping in the mosque, meaning wiping over pebbles, and he said: "If you must do it, then only once."  

ذَكَرَ لِلنَّبِيِّ الْمَسْحَ فِي الْمَسْجِدِ يَعْنِي الْحَصَى فَقَالَ إِنْ كُنْتَ لَا بُدَّ فَاعِلًا فَوَاحِدَةً  

[Machine] It was said to the Prophet ﷺ , "Wiping the mosque meaning the pebbles." He said, "If you must do it, do it only once."  

قِيلَ لِلنَّبِيِّ ﷺ الْمَسْحُ فِي الْمَسْجِدِ يَعْنِي الْحَصَى فَقَالَ إِنْ كُنْتَ لَا بُدَّ فَاعِلًا فَوَاحِدَةً  

The Messenger of Allah said: 'Woe to the heels because of Hell-fire.'" (Using translation from Ibn Mājah 451)  

قَالَ رَسُولُ اللهِ ﷺ وَيْلٌ لِلْأَعْقَابِ مِنَ النَّارِ  

The Prophet ﷺ talked about a man leveling the earth on prostrating, and said, "If you have to do so, then do it once." (Using translation from Bukhārī 1207)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ فِي الرَّجُلِ يُسَوِّي التُّرَابَ حَيْثُ يَسْجُدُ قَالَ إِنْ كُنْتَ فَاعِلًا فَوَاحِدَةً