What did the Prophet Muhammad (Peace be upon him) take an oath to refrain from consuming again when having drank honey in the house of Zainab, daughter of Jahsh?
 Narrated `Aisha:                     Allah's Apostle used to drink honey in the house of Zainab, the daughter of Jahsh, and would stay there with her. So Hafsa and I agreed secretly that, if he come to either of us, she would say to him. "It seems you have eaten Maghafir (a kind of bad-smelling resin), for I smell in you the smell of Maghafir," (We did so) and he replied. "No, but I was drinking honey in the house of Zainab, the daughter of Jahsh, and I shall never take it again. I have taken an oath as to that, and you should not tell anybody about it."