It is narrated from Sayyida Juwayriya (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) came to her on a Friday while she was fasting. He (peace and blessings be upon him) asked her: "Did you fast yesterday?" She replied: "No." He (peace and blessings be upon him) then asked: "Do you intend to fast tomorrow?" She replied: "No." The Prophet (peace and blessings be upon him) said: "Then break your fast."