Sahih Bukhari
Prophetic Commentary on the Quran (Tafseer of the Prophet (PBUH))
Volume: 006 / Book Number: 060 / Hadith Number: 310
Narrated Anas bin Malik:
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.