(22) باب فِي إِبَاحَةِ الاِسْتِلْقَاءِ وَوَضْعِ إِحْدَى الرِّجْلَيْنِ عَلَى الأُخْرَى .
'Abbad b. Tamim reported from his uncle that he saw Allah's Messenger (ﷺ) lying in the mosque and placing his one foot upon the other.
Reference: Sahih Muslim 2100 a
In-book reference: Book 37, Hadith 119
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5239