Narrated from Umm al-Mu’minin Juwayriya bint al-Harith (may Allah be pleased with her) that the Prophet Muhammad (peace and blessings be upon him) came to her on a Friday and she was fasting. He (peace be upon him) said:“Did you fast yesterday?”She replied:“No.”Then he (peace be upon him) said:“Do you intend to fast tomorrow?”She again replied:“No.”So he (peace be upon him) said:“(If not) then do not fast today, that is, break your fast.”