Sahih al-Bukhari Book 65, Hadith 316
When Allah's Messenger (ﷺ) married Zainab bint Jahsh, he made the people eat meat and bread to their fill
(by giving a Walima banquet). Then he went out to the dwelling places of the mothers of the believers
(his wives), as he used to do in the morning of his marriage. He would greet them and invoke good on
them, and they (too) would return his greeting and invoke good on him. When he returned to his
house, he found two men talking to each other; and when he saw them, he went out of his house again.
When those two men saw Allah's Messenger (ﷺ): going out of his house, they quickly got up (and departed).
I do not remember whether I informed him of their departure, or he was informed (by somebody else).
So he returned, and when he entered the house, he lowered the curtain between me and him. Then the
Verse of Al-Hijab was revealed.
A banquet of bread and meat was held on the occasion of the marriage of the Prophet (ﷺ) to Zainab bint Jahsh. I was sent to invite the people (to the banquet), and so the people started coming (in groups); They would eat and then leave. Another batch would come, eat and leave. So I kept on inviting the people till I found nobody to invite. Then I said, "O Allah's Prophet! I do not find anybody to invite." He said, "Carry away the remaining food." Then a batch of three persons stayed in the house chatting. The Prophet (ﷺ) left and went towards the dwelling place of Aisha and said, "Peace and Allah's Mercy be on you, O the people of the house!" She replied, "Peace and the mercy of Allah be on you too. How did you find your wife? May Allah bless you. Then he went to the dwelling places of all his other wives and said to them the same as he said to Aisha and they said to him the same as Aisha had said to him. Then the Prophet (ﷺ) returned and found a group of three persons still in the house chatting. The Prophet was a very shy person, so he went out (for the second time) and went towards the dwelling place of `Aisha. I do not remember whether I informed him that the people have gone away. So he returned and as soon as he entered the gate, he drew the curtain between me and him, and then the Verse of Al-Hijab was revealed.
Sauda (the wife of the Prophet) went out to answer the call of nature after it was made obligatory (for all the Muslims ladies) to observe the veil. She had a large frame and everybody who knew her before could recognize her. So `Umar bin Al-Khattab saw her and said, "O Sauda! By Allah, you cannot hide yourself from us, so think of a way by which you should not be recognized on going out. Sauda returned while Allah's Messenger (ﷺ) was in my house taking his supper and a bone covered with meat was in his hand. She entered and said, "O Allah's Messenger (ﷺ)! I went out to answer the call of nature and `Umar said to me so-and-so." Then Allah inspired him (the Prophet) and when the state of inspiration was over and the bone was still in his hand as he had not put in down, he said (to Sauda), "You (women) have been allowed to go out for your needs."