Anas bin Malik reported,

Zaynab bint Jahsh used to boast over the wives of the Prophet ﷺ, saying, "Allah gave me in marriage from above the heavens."On the day of her wedding, bread and meat were served. The guests remained seated in the house as they were, then the Messenger of Allah ﷺ got up and went out. He stayed away as long as Allah willed, then returned, and the guests were still sitting as they had been. This troubled him, and the displeasure showed on his face. Then the verse of the veil was revealed.

حدثنا هاشم حدثنا محمد بن عبد الله حدثنا عيسى بن طهمان قال سمعت

أنسا قال

كانت زينب بنت جحش تفخر على نساء النبي ﷺ تقول إن الله عز وجل أنكحني من السماء وأطعم عليها يومئذ خبزا ولحما وكان القوم جلوسا كما هم في البيت فقام رسول الله ﷺ فخرج فلبث ما شاء الله أن يلبث ثم رجع والقوم جلوس كما هم فشق ذلك عليه وعرف في وجهه فنزل آية الحجاب