عَنْ جَابِرٍ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ إِذَا جَلَسَ (أَوْ إِذَا اسْتَلْقَى) أَحَدُكُمْ فَلَا يَضَعْ رِجْلَيْهِ إِحْدَاهُمَا عَلَى الْأُخْرَى
It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: When a person lies on his back, he should not place one leg over the other.