(36) باب فِي الرَّجُلِ يَضَعُ إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى
Jabir said:
The Messenger of Allah(ﷺ) forbade that a man should lie placing(and according to Qutaibah's version: "should raise") one of his legs over the other. Qutaibah's version adds: When he was lying on his back.
Reference: Sunan Abi Dawud 4865
In-book reference: Book 43, Hadith 93
English translation: Book 42, Hadith 4847