It is well known that acts of worship are not established except by a textual proof from the Book or the Sunnah, so what is the ruling on what some mu'adhdhins do during the Friday prayer after the adhan?

Al-Halabi: It is well known that acts of worship in Islam are not established except by a text from the Book of Allah or the Sunnah of the Messenger of Allah (peace and blessings be upon him), so it is not permissible to invent a dhikr or an act of worship except with evidence from the Book of Allah and the Sunnah of His Messenger. So what is the ruling on what some people or some mu'adhdhins do during the Friday prayer at the first adhan, when the mu'adhdhin recites... al-Ikhlas twice or three times to alert the people, as he says, to the prayer or its establishment, or to the khutbah? What is the ruling on this action?

The Shaykh : There is no doubt and no hesitation in the fact that such a matter is as the Messenger (peace be upon him) indicated in some of the hadiths regarding the newly invented matters.
There is no doubt that the matter was, in the time of the Prophet (peace and blessings be upon him and his family), on Friday and in all five prayers on the other days of the week, that there was nothing but the adhan and the iqamah. There was nothing that preceded the adhan or followed the adhan, just as there was nothing that preceded the iqamah or followed the iqamah from the mu'adhdhin and the one who gives the iqamah. Since the matter is so, we must keep in mind what our Prophet (may the prayers and peace of Allah be upon him) used to preach to the Companions every Friday. He would begin the Friday khutbah by saying and he would say in the Friday khutbah and he added in a hadith or in a narration of al-Nasa'i If this is true, and it is truly so, the best guidance is the guidance of Muhammad (peace and blessings be upon him and his family), then it is not permissible for a Muslim who truly believes in Allah and His Messenger to precede what has come to us from the law of his Lord by adding or subtracting. The matter is as the common people say in some lands: "The one who adds is the brother of the one who subtracts" ... The man who prays Fajr three or four times, like the one who prays Maghrib four or two times, there is no difference between the two matters, because both are contrary to what the Messenger (may the prayers and peace of Allah be upon him) brought. It is not said here, as is said by many of the heedless and ignorant, "My brother, this is in the obligatory prayer," meaning he immediately agrees that it is not permissible to pray Fajr three or four times, and he immediately agrees that it is not permissible to pray Maghrib four or two times. And the answer with them, they claim, is "This is obligatory." We say, "Fine. Praise be to Allah, we agreed on the obligatory. Now let us descend to what is not obligatory, to the Sunnah. Is it permissible for you to pray the Sunnah of Fajr three or four times?" Here the poor man is stunned because he is among the heedless. And when he wakes up after that, after a long time, we say to him, "May Allah reward you with good..."