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.
نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَضَعَ وَقَالَ قُتَيْبَةُ يَرْفَعَ الرَّجُلُ إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى زَادَ قُتَيْبَةُ وَهُوَ مُسْتَلْقٍ عَلَى ظَهْرِهِ
Jabir reported that Messenger of Allah 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.
أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ اشْتِمَالِ الصَّمَّاءِ وَالاِحْتِبَاءِ فِي ثَوْبٍ وَاحِدٍ وَأَنْ يَرْفَعَ الرَّجُلُ إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى وَهُوَ مُسْتَلْقٍ عَلَى ظَهْرِهِ
"The Messenger of Allah ﷺ prohibited Ishtimal As-Samma, Al-Ihtiba in one garment, and that a man raise one of his feet atop the other while he is reclining on his back."
أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنِ اشْتِمَالِ الصَّمَّاءِ وَالاِحْتِبَاءِ فِي ثَوْبٍ وَاحِدٍ وَأَنْ يَرْفَعَ الرَّجُلُ إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى وَهُوَ مُسْتَلْقٍ عَلَى ظَهْرِهِ
Jabir reported that Messenger of Allah 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. (Using translation from Muslim 2099c)
«أَنَّ رَسُولَ اللهِ ﷺ نَهَى عَنِ اشْتِمَالِ الصَّمَّاءِ وَالِاحْتِبَاءِ فِي ثَوْبٍ وَاحِدٍ وَأَنْ يَرْفَعَ الرَّجُلُ إِحْدَى رِجْلَيْهِ عَلَى الْأُخْرَى وَهُوَ مُسْتَلْقٍ عَلَى ظَهْرِهِ»