(21) باب فِي مَنْعِ الاِسْتِلْقَاءِ عَلَى الظَّهْرِ وَوَضْعِ إِحْدَى الرِّجْلَيْنِ عَلَى الأُخْرَى .
Jabir reported that Allah's Messenger (ﷺ) forbade the wrapping of oneself completely leaving no room for the arm and supporting oneself when sitting with a single garment wrapped round one's knees and a person raising one of his feet and placing it on the other while lying on his back.
Reference: Sahih Muslim 2099 c
In-book reference: Book 37, Hadith 116
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5236