Sahih Bukhari | Volume 3 | Hadith Number 207

Narrated by Abu Aiyub from Juwairiya bint Al-Harith
The Prophet visited her (Juwairiya) on a Friday and she was fasting. He asked her, "Did you fast yesterday?" She said, "No." He said, "Do you intend to fast tomorrow?" She said,

No." He said, "Then break your fast." Through another series of narrators, Abu Aiyub is reported to have said, "He ordered her and she broke her fast."