Sayyidah Umm Hani (may Allah be pleased with her) came to the Messenger of Allah (peace and blessings be upon him) on the day of the Conquest of Makkah, and he (peace and blessings be upon him) brought a drink; he (peace and blessings be upon him) drank from it and also gave her to drink. She said: I was fasting, but I disliked returning your drink to you. 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 / 21364