The Shaykh’s illustration of the Prophet’s (peace and blessings be upon him) prohibition against connecting the obligatory Friday prayer with voluntary prayer afterward.

The Shaykh : And in the same category is what is reported in Sahih Muslim regarding the prohibition by the Messenger (peace and blessings be upon him) of connecting the obligatory Friday prayer with the recommended practice (sunnah) that follows it. He commanded separation between the obligatory and the voluntary, either by speaking or by leaving and departing. The Messenger (peace and blessings be upon him) prohibited connecting the obligatory prayer with the recommended practice that follows it. This is also in the category of blocking the means to harm, so that what is not part of the obligatory prayer is not connected to it. On Friday in particular, and all obligatory prayers in general, one should separate by speaking, or by leaving and changing location, or by speaking with your companion in ordinary conversation to achieve this separation. Know that the matter is as he (peace and blessings be upon him) said regarding prayer: meaning that what was forbidden to you in prayer becomes permissible as soon as you say "Peace be upon you and Allah's mercy" in the first closing salam. However, to emphasize this separation beyond just the salam, and to block the means of connecting something that is not part of this obligatory prayer—which is the obligatory prayer—with it, the Messenger (peace and blessings be upon him) emphasized to the one praying that he should speak or depart to the right, left, front, or back. All of this confirms the matter that the Messenger (peace and blessings be upon him) commanded, which is not to precede Ramadan by fasting one or two days, so that the month of Ramadan remains without any addition to it, just as it is not permissible to subtract from it. The extra, as the common people say, is the brother of the deficient. He says: Is this prohibition absolute? The Messenger (peace and blessings be upon him) answered this question: This exception clarifies that the previous prohibition is specific to one who intentionally precedes Ramadan by fasting one or two days. As for another person who has a system of fasting, for example, if it is his custom to follow the known recommended practice of fasting Monday and Thursday of every week, and it happens that Thursday comes and it is one day before Ramadan, does he fall under this prohibition? The answer is no, except for a man who has a fast to fulfill, let him fulfill it. So the one who has accustomed himself to this recommended fasting is permitted to precede Ramadan with such fasting because he did not intend this advancement. And the direct target of this prohibition is fasting the day of doubt, about which a specific hadith will be mentioned, because the one who fasts the day of doubt fasts the day that precedes Ramadan, and it has not yet been established that this day, the day of doubt, is from Ramadan, so he fasts it as a precaution.