جامع الترمذي

Ubaidulah bin Umar narrated that : Nafi said: "Umar bin Adbul-Aziz asked me about charity due on honey, so I said to him: 'We do not have honey that we could give charity from, but Al-Mughirah bin Hakim informed us that he (pbuh) said: 'There is no charity due on honey.' So Umar said: 'That is fair enough for me.' So he wrote to the people that is be lifted, meaning (the duty of paying it) from them."