Ayesha reported, "The Messenger of Allah ﷺ was lying down in my house with his thighs, or his shins, uncovered. Abu Bakr asked permission to enter, and he granted it while remaining in that state, and they conversed. Then Umar asked permission to enter, and he granted it while still in that state, and they conversed. Then Uthman asked permission to enter, and the Messenger of Allah ﷺ sat up and adjusted his clothing." Muhammad said, "I do not claim this all happened on the same day." Uthman then entered and they conversed. After he left, Ayesha said, "Abu Bakr came in and you did not stir for him or pay him special attention. Then Umar came in and you did not stir for him or pay him special attention. Then Uthman came in and you sat up and straightened your clothes."He replied, "Should I not feel shy before a man whom even the angels feel shy before?"
كان رسول الله ﷺ مضطجعا في بيتي، كاشفا عن فخذيه- أو ساقيه- فاستأذن أبو بكر، فأذن له، وهو على تلك الحال، فتحدث، ثم استأذن عمر فأذن له، وهو كذلك، فتحدث، ثم استأذن عثمان فجلس رسول الله ﷺ، وسوى ثيابه- قال محمد: ولا أقول ذلك في يوم واحد- فدخل فتحدث، فلما خرج قالت عائشة: دخل أبو بكر فلم تهتش له ولم تباله، ثم دخل عمر فلم تهتش له ولم تباله، ثم دخل عثمان فجلست وسويت ثيابك، فقال: ألا أستحي من رجل تستحي منه الملائكة.
Muslim narrated it in the Virtues of the Companions (2401:26) through several routes from Ismail bin Jafar, from Muhammad bin Abu Harmala, from Ataa, Sulayman bin Yasar, and Abu Salama bin Abdul-Rahman, that Ayesha said, and then he mentioned it. This is how Muslim narrated it, "about his thighs or his shins," with the doubt included. Ahmad narrated it with a hasan chain (24330) through another route from Ayesha, "He was sitting with his thighs uncovered," without the doubt.