Sahih al-Bukhari Book 65, Hadith 309
The Verse: 'But you did hide in your mind that which Allah was about to make manifest.' (33.37)
was revealed concerning Zainab bint Jahsh and Zaid bin Haritha.
(the wife of the Prophet) when Allah's Messenger (ﷺ) was ordered to give option to his wives, he started with me, saying, "I am going to mention to you something, but you shall not hasten (to give your reply) unless you consult your parents." The Prophet (ﷺ) knew that my parents would not order me to leave him. Then he said, "Allah says: 'O Prophet (Muhammad)! Say to your wives: If you desire the life of this world and its glitter........a great reward." (33.28-29) I said, "Then why I consult my parents? Verily, I seek Allah, His Apostle and the Home of the Hereafter." Then all the other wives of the Prophet (ﷺ) did the same as I did.
I used to look down upon those ladies who had given themselves to Allah's Messenger (ﷺ) and I used to say, "Can a lady give herself (to a man)?" But when Allah revealed: "You (O Muhammad) can postpone (the turn of) whom you will of them (your wives), and you may receive any of them whom you will; and there is no blame on you if you invite one whose turn you have set aside (temporarily).' (33.51) I said (to the Prophet), "I feel that your Lord hastens in fulfilling your wishes and desires."