وَعَنْ جَابِرٍ قَالَ: نَهَى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ يَرْفَعَ الرَّجُلُ إِحْدَى رِجْلَيْهِ عَلَى الْأُخْرَى وَهُوَ مُسْتَلْقٍ عَلَى ظَهْرِهِ. رَوَاهُ مُسلم
Jabir (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) forbade a man from lying on his back with one leg placed over the other. Narrated by Muslim.