Sahih Muslim | Book 24 | Chapter 16

Narrated by Jabir
Jabir reported that Allah's Messenger (may peace be upon him) 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.2512

Narrated by Jabir. b. Abdullah
Jabir. b. Abdullah reported Allah's Messenger (may peace be upon him) 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.

Narrated by Jalbir b. Abdullah
Jalbir b. Abdullah reported Allah's Messenger (may peace be upon him) as saying: None of you should lie on his back and place one of his feet upon the other.