that his uncle said, "I saw Messenger of Allah ﷺ lying flat (on his back) in the mosque with one leg on the other." Narrated Saʿid bin Al-Musaiyab that ʿUmar and ʿUthman used to do the same.  

أَنَّهُ رَأَى رَسُولَ اللَّهِ ﷺ مُسْتَلْقِيًا فِي الْمَسْجِدِ وَاضِعًا إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى وَعَنِ ابْنِ شِهَابٍ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ قَالَ كَانَ عُمَرُ وَعُثْمَانُ يَفْعَلاَنِ ذَلِكَ