It was narrated that Anas said: When the 'Iddah of Zainab was over, the Messenger of Allah said to Zaid: 'Propose marriage to her on my behalf.' Zaid went and said: 'O Zainab, rejoice, for the Messenger of Allah has sent me to you to propose marriage on his behalf.' She said: 'I will not do anything until I consult my Lord.' She went to her prayer place and Qur'an was revealed, then the Messenger of Allah came and entered upon her without any formalities.
Anas bin Malik said: Zainab bint Jahsh used to boast to the other wives of the Prophet and say: Allah married me to him from above the Heavens. And the Verse of Hijab was revealed concerning her.