Sahih Bukhari Volume 7, Book 63, Hadith Number 192.

Narrated By ‘Ubaid bin ‘Umar : I heard ‘Aisha saying, “The Prophet used to stay for a long while with Zanab bint Jahsh and drink honey at her house. So Hafsa and I decided that if the Prophet came to anyone of us, she should say him, “I detect the smell of Maghafir (a nasty smelling gum) in you. Have you eaten Maghafir?’ ” So the Prophet visited one of them and she said to him similarly. The Prophet said, “Never mind, I have taken some honey at the house of Zainab bint Jahsh, but I shall never drink of it anymore.” So there was revealed: ‘O Prophet ! Why do you ban (for you) that which Allah has made lawful for you… If you two (wives of Prophet) turn in repentance to Allah,’ (66.1-4) addressing ‘Aisha and Hafsa. ‘When the Prophet disclosed a matter in confidence to some of his wives.’ (66.3) namely his saying: But I have taken some honey.”