Riyad as-Salihin #1084
The Book of the Prohibited actions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وعن أم المؤمنين جويرة بنت الحارس رضي الله عنها أن النبي صلى الله عليه وسلم دخل عليها يوم الجمعة وهي صائمة، فقال: " أصمت أمس؟" قالت: لا، قال: " تريدين أن تصومي غدا " قالت: لا، قال : "فأفطري" ((رواه البخاري))
Juwairiyah bint Al-Harith (May Allah be pleased with her), the Mother of the Believers, said that the Prophet (ﷺ) visited her on a Friday and she was observing fast. He asked, "Did you observe fast yesterday?" She said, "No." He asked, "Do you intend to observe fast tomorrow?" She said, "No." He said, "In that case, give up your fast today.".
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About Riyad as-Salihin
This hadith is #1084 from Riyad as-Salihin, in the Book of The Book of the Prohibited actions.