Riyad as-Salihin #1084
The Book of the Prohibited actions
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. Riyad as-Salihin contains 1,896 hadiths across 20 books.