(21) باب فِي مَنْعِ الاِسْتِلْقَاءِ عَلَى الظَّهْرِ وَوَضْعِ إِحْدَى الرِّجْلَيْنِ عَلَى الأُخْرَى .
Jabir. b. Abdullah reported Allah's Messenger (ﷺ) as saying:
Do not walk in one sandal and do not wrap the lower garment round your knees and do not eat with your left hand and do not wrap yourself completely leaving no room for the arms (to draw out) and do not place one of your feet upon the other while lying on your back.
Reference: Sahih Muslim 2099 d
In-book reference: Book 37, Hadith 117
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5237