Sahih Muslim 6209

Aisha reported:Allah's Messenger (ﷺ) was lying in the bed in my apartment with his thigh uncovered and Abu Bakr sought permission to enter. It was given to him and he conversed in the same very state (the Prophet's thigh or shank uncovered). Then `Umar sought permission for entering and it was given to him and he conversed in that very state. Then `Uthman sought permission to enter; Allah's Messenger (ﷺ) sat down and he set right his clothes. Muhammad (one of the narrators) said: I do not say that it happened on the same day. He (`Uthman) then entered and conversed and as he went out, `Aisha said: Abu Bakr entered and you did not stir and did not observe much care (in arranging your clothes), then `Umar entered and you did not stir and did not arrange your clothes, then `Uthman entered and you got up and set your clothes right, so he (ﷺ) said: Should I not show modesty to one whom even the Angels show modesty