[Machine] The Prophet ﷺ entered upon her while she was fasting. Then a vessel was brought to him and he drank from it, and also offered it to her and she drank from it. The Messenger of Allah ﷺ said, "If it is a missed fast from Ramadan, then fast another day instead. And if it is a voluntary fast, then if you wish, complete it, and if you wish, break it."  

أَنَّ النَّبِيَّ ﷺ دَخَلَ عَلَيْهَا وَهِيَ صَائِمَةٌ فَأُتِيَ بِإِنَاءٍ فَشَرِبَ ثُمَّ نَاوَلَهَا فَشَرِبَتْ فَقَالَ رَسُولُ اللَّهِ ﷺ «إِنْ كَانَ قَضَاءَ رَمَضَانَ فَصُومِي يَوْمًا آخَرَ وَإِنْ كَانَ تَطَوُّعًا فَإِنْ شِئْتِ فَاقْضِيهِ وَإِنْ شِئْتِ فَلَا تَقْضِيهِ»  

On the days of the conquest of Mecca, when Mecca was captured, Fatimah came and sat on the left side of the Messenger of Allah ﷺ, and Umm Hani was on his right side. A slave-girl brought a vessel which contained some drink; she gave it to him and he drank of it. He then gave it to Umm Hani who drank of it. She said: Messenger of Allah, I have broken my fast; I was fasting. He said to her: Were you making atonement for something? She replied: No. He said: Then it does not harm you if it was voluntary (fast). (Using translation from Abū Dāʾūd 2456)  

لَمَّا كَانَ يَوْمُ فَتْحِ مَكَّةَ جَاءَتْ فَاطِمَةُ فَجَلَسَتْ عَنْ يَسَارِ رَسُولِ اللَّهِ ﷺ وَأُمُّ هَانِئٍ عَنْ يَمِينِهِ قَالَتْ فَجَاءَتِ الْوَلِيدَةُ بِإِنَاءٍ فِيهِ شَرَابٌ فَنَاوَلَتْهُ فَشَرِبَ مِنْهُ ثُمَّ نَاوَلَهُ أُمَّ هَانِئٍ فَشَرِبَتْ مِنْهُ ثُمَّ قَالَتْ يَا رَسُولَ اللَّهِ لَقَدْ أَفْطَرْتُ وَكُنْتُ صَائِمَةً فَقَالَ لَهَا «أَكُنْتِ تَقْضِينَ شَيْئًا؟» قَالَتْ لَا قَالَ فَلَا يَضُرُّكِ إِنْ كَانَ تَطَوُّعًا قَالَ أَبُو مُحَمَّد أَقُولُ بِهِ