Abu Dawud Book 7, Hadith Number 2451.

Narated By ‘Aisha, Ummul Mu’minin : Some food was presented to me and Hafsah. We were fasting, but broke our fast. Then the Apostle of Allah (PBUH) entered upon us. We said to him: A gift was presented to us; we coveted it and we broke our fast. The Apostle of Allah (PBUH) said: There is no harm to you; keep a fast another day in lieu of it.