Acts of worship are among the Tawqīfi matters all of whose actions must be taken from the Shariah, with no addition or omission. And none of them may be singled out for specific times unless it is prescribed in the Shariah. In this Hadīth, the Prophet (may Allah's peace and blessings be upon him) forbids that the night of Friday be singled out for Qiyām involving prayer and Dhikr apart from the other nights of the week. He also forbade that Friday be singled out for fasting apart from the other days of the week, unless this coincides with a certain fast a Muslim usually observes, such as when he fasts every other day, and the day he fasts coincides with Friday, or he makes a vow and its time happens to coincide with Friday, or other things that oblige him to observe fasting. In the Two Sahīh Collections: "None of you should fast on Friday unless he fasts a day before or after it." So, he should fast on Thursday or Saturday along with it. It is said: The prohibition of singling out Friday and its night for these acts aims at differing from the Jews and the Christians, for the Jews hold that Saturday should be singled out for fasting, out of reverence to it, and the Christians hold that Sunday should be singled out for fasting, out of reverence to it, and its night for Qiyām al-Layl. Since Friday occupies a status within this Ummah like the status of these two days within the two groups, it is recommended that our practice be different from theirs in the way of revering this day..