that the Messenger of Allah ﷺ saw a man laying on his stomach so he said: "Indeed such laying is not loved by Allah."  

رَأَى رَسُولُ اللَّهِ ﷺ رَجُلاً مُضْطَجِعًا عَلَى بَطْنِهِ فَقَالَ إِنَّ هَذِهِ ضَجْعَةٌ لاَ يُحِبُّهَا اللَّهُ وَفِي الْبَابِ عَنْ طِهْفَةَ وَابْنِ عُمَرَ