(36) باب فِي الرَّجُلِ يَضَعُ إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى
Sa'id b. al-musayyab said :
'Umar b. al-khattab and 'Uthman b. 'Affan used to do that.
Reference: Sunan Abi Dawud 4867
In-book reference: Book 43, Hadith 95
English translation: Book 42, Hadith 4849