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.
Hadith Referenceمشكوة المصابيح / كتاب الآداب / 4709
Hadith Gradingالألبانی:صَحِيح | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه مسلم (2099/72)»