Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad:26909 – Muḥammad b. Jaʿfar > Shuʿbah > Jaʿdah > Um Hāniʾ And Hī Jaddatuh

[Machine] The Messenger of Allah ﷺ entered upon her on the day of the conquest, and a drink was brought to him, so he drank and then offered it to me. I said, "Indeed, I am fasting." The Messenger of Allah ﷺ said, "The one who observes voluntary fasting is in control of their own self. So if you wish, continue your fast and if you wish, break your fast."  

أحمد:٢٦٩٠٩ – حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ قَالَ حَدَّثَنَا شُعْبَةُ عَنْ جَعْدَةَ عَنْ أُمِّ هَانِئٍ وَهِيَ جَدَّتُهُ

أَنَّ رَسُولَ اللهِ ﷺ دَخَلَ عَلَيْهَا يَوْمَ الْفَتْحِ فَأُتِيَ بِشَرَابٍ فَشَرِبَ ثُمَّ نَاوَلَنِي فَقُلْتُ إِنِّي صَائِمَةٌ فَقَالَ رَسُولُ اللهِ ﷺ إِنَّ الْمُتَطَوِّعَ أَمِيرٌ عَلَى نَفْسِهِ فَإِنْ شِئْتِ فَصُومِي وَإِنْ شِئْتِ فَأَفْطِرِي  

See similar narrations below:

Collected by Dārimī
darimi:1776 – Abū al-Nuʿmān > Ḥammād b. Salamah > Simāk b. Ḥarb > Hārūn Ibn Āb.ah Um Hāniʾ or Ibn Āb. Um Hāniʾ > Um Hāniʾ

[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."  

الدارمي:١٧٧٦ – أَخْبَرَنَا أَبُو النُّعْمَانِ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ عَنْ سِمَاكِ بْنِ حَرْبٍ عَنْ هَارُونَ ابْنِ ابْنَةِ أُمِّ هَانِئٍ أَوْ ابْنِ ابْنِ أُمِّ هَانِئٍ عَنْ أُمِّ هَانِئٍ

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»