Sahih Bukhari | Volume 9 | Hadith Number 516
Narrated by Anas
Zaid bin Haritha came to the Prophet complaining about his wife. The Prophet kept on saying (to him), "Be afraid of Allah and keep your wife." 'Aisha said, "If Allah's Apostle were to conceal anything (of the Qur'an he would have concealed this Verse." Zainab used to boast before the wives of the Prophet and used to say, "You were given in marriage by your families, while I was married (to the Prophet) by Allah from over seven Heavens." And Thabit recited, "The Verse: 'But (O Muhammad) you did hide in your heart that which Allah was about to make manifest, you did fear the people,' (33:37) was revealed in connection with Zainab and Zaid bin Haritha."