It is narrated from Sayyidah Umm Hani (may Allah be pleased with her) that on the day of the Conquest of Makkah a drink was brought to the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) drank from it, then handed it to me and I drank, although I was fasting. I said: O Messenger of Allah! I have drunk, although I was fasting. He (peace and blessings be upon him) said: "Were you making up a fast?" I said: No. He (peace and blessings be upon him) said: "Then it does you no harm."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21361