Mukhtasar Bukhari

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.”