Sahih al-Bukhari 4793

It is related that Anas said, "There was a meal of bread and meat for the marriage of the Prophet, may Allah bless him and grant him peace, to Zaynab bint Jahsh. I was sent to visit the people to the food, and the people came, ate and then left. Then another group would come, eat and leave. I continued to invite people until I could not find anyone else to invite. I said, 'Prophet of Allah! I do not find anyone else to invite.' He said, 'Remove your food.' A group of three remaining in the room conversing. The Prophet, may Allah bless him and grant him peace, went out and went to the room of 'A'isha and said, 'Peace be upon you, people of the house, and His mercy.' She said, 'Peace and the mercy of Allah be upon you? How did you find your wife. May Allah bless you.' He visited the rooms of all of his wives, one after the other, saying to them the like of what he had said to 'A'isha and they answered him with the like of what 'A'isha had said. Then the Prophet, may Allah bless him and grant him peace, returned and the three people were still conversing in the house. The Prophet, may Allah bless him and grant him peace, was very shy and so went out towards the room of 'A'isha. I do not know whether I told him or he was told that the people had left. He came back and as soon as he had placed one foot across the threshold, while the other was still on the outside, he lowered the curtain between me and him and the Ayat of the Veil was revealed."