Sayyidah Umm Hani (may Allah be pleased with her) said: I was sitting with the Prophet (peace and blessings be upon him) when a drink was brought to him (peace and blessings be upon him). He (peace and blessings be upon him) drank from it, then handed it to me, and I also drank from it. I said: O Messenger of Allah! I think I have committed a fault. He (peace and blessings be upon him) said: "What is that?" I said: I was fasting, but I disliked turning back your hand, so I drank. He (peace and blessings be upon him) said: "Was it a fast that you were making up?" I said: No. He (peace and blessings be upon him) said: "Then it does you no harm."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21360