Musnad Ahmad 33:337

Muhammad ibn Bakr narrated to us, Ibn Jurayj informed us, he said: And Abu al-Zubayr informed me that he heard Jabir ibn Abdullah saying: The Prophet, peace and blessings of Allah be upon him, said: "Do not walk in one sandal, and do not sit in a single garment (wrapping yourself in it such that your private parts are not secure), and do not eat with your left hand. And do not wrap yourself in the *al-samma'* (a style of wrapping the garment that leaves no opening for the arms), and do not place one of your legs over the other when you are lying on your back."