Anas bin Malik reported,

The Messenger of Allah ﷺ held a wedding feast when he consummated his marriage with Zaynab bint Jahsh, satisfying the people with bread and meat. Then he went out to the chambers of the Mothers of the Believers, as was his custom on the morning after consummating a marriage. He greeted them and prayed for them, and they greeted him and prayed for him.When he returned to his house, he saw two men engaged in conversation. Upon seeing them, he turned away from his house. When the two men noticed that the Prophet ﷺ had turned away from his house, they sprang up and hurried out.I do not know whether I was the one who informed him of their departure or whether someone else did. He came back and entered the house, and he let down a curtain between him and me, and the verse of the hijab was revealed.

Ahmad 13769

Sahih

حدثنا عبد الله بن بكر قال حدثنا حميد

عن أنس بن مالك قال

أولم رسول الله ﷺ حين بنى بزينب بنت جحش فأشبع الناس خبزا ولحما ثم خرج إلى حجر أمهات المؤمنين كما كان يصنع صبيحة بنائه فيسلم عليهن ويدعو لهن ويسلمن عليه ويدعون له فلما رجع إلى بيته رأى رجلين جرى بينهما الحديث فلما رآهما رجع عن بيته فلما رأيا النبي ﷺ رجع عن بيته وثبا مسرعين قال فما أدري أنا أخبرته بخروجهما أم أخبر فرجع حتى دخل البيت وأرخى الستر بيني وبينه وأنزلت آية الحجاب

أحمد 13769صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Anas bin Malik
Numbering
Darussalam 13769
Ahmad 13769