FRIDAY AND SATURDAY IN ISLAM

Muslims celebrate Friday because:
1. On this day, Allah created Adam and Eve, i.e. completed the creation.
2. This day "has absorbed many benefits and virtues."
Friday is the day of the gathering of Muslims for worship, prescribed by the Sharia, and it is "the day of the gathering of people on the Day of Judgment, ordained by Allah Almighty."
Friday is “the day of sending down numerous blessings, one of which is the forgiveness of sins by Allah,” committed by a believer between two Fridays, provided that he avoided major sins (Arabic “kabair”). Muhammad said: "Five times prayer, as well as Friday prayer until the next Friday prayer, and Ramadan until the next Ramadan - all this is atonement for sins, if great sins were not committed" (Muslim, 233, hadith from Abu Hureira).
Friday is the day celebrated by Bilyal, the muezzin of the Prophet Muhammad, on which he conducted namaz (prayer), reciting the adhan (call to prayer) in the presence of Muhammad, who then delivered a sermon (khutba).
It is narrated from Abu Hureira that the Prophet Muhammad said: “If any of you performed the Friday prayer, then let him perform four rak'ahs (special bows) after it” (Muslim, 881). This is not the Koran, but hadith, that is, tradition.

(according to the article by Muhammad Vakhitov).

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However, unlike the hadiths, the Qur'an only refers to SATURDAY as a holy day:
The Bible speaks of the Sabbath in both the Old and New Testaments. The Koran turns out to be too! There Friday is NOT AT ALL REMEMBERED, it is only mentioned in the comments to the Koran.
What does the Qur'an say about this? Is there an indication in the Qur'an as to which day of the week should be observed for the Lord?
The Friday commandment was written by people, most often in an attempt to somehow tie the text of the Koran to the traditional beliefs of modern Muslims. Of course, we cannot show what is not. But this is easy to verify: take any electronic text of the Quran without comments, and search for the word "Friday" in the text. He's not there.
But it's interesting what the Qur'an says about the Sabbath:
“You knew those of you who broke the Sabbath. We told them: "Be despicable monkeys!" (Sura 2: Ayat 65)
What is the attitude of Allah towards those who break the Sabbath? Allah's words are unambiguous. And if we remember that the Torah and Injil (Gospel) are the same Holy Scripture sent down from Allah, like the Quran (see "The Quran directs Muslims to the Bible"), then it turns out that Saturday is intended for all people, including for Muslims.
“O those to whom the Scripture was given! Believe in what We have sent down in confirmation of what you have, until We erased your faces and turned them back, until We cursed you as we cursed those who violated the Sabbath. Allah's command will certainly be fulfilled! (4:47)
These words of Allah are directed to all who accept the Scripture, that is, to Jews, Christians and Muslims. Allah calls to believe in everything that was sent down earlier, as well as in everything that was sent down now. And immediately a warning about the curse is pronounced. And this warning includes a reminder to keep the Sabbath. Yes, you need to observe all the requirements of the Scriptures, including the Sabbath, otherwise the curse of the Most High will not slow down.
“… We also told them:“ Don't break the Sabbath! ”. We made a stern covenant with them. (4: 154)
And then Allah claims that keeping the Sabbath is part of the covenant between God and man.
“Indeed, the Sabbath was prescribed only to those who were in disagreement about this. Indeed, your Lord on the Day of Resurrection will judge between them in what they disagreed with. (16: 124)
This text at first seems to impose restrictions on Sabbath observance - supposedly the Sabbath was not given to all people, but only to some. However, if we think about who is in disagreement over the Sabbath, we will understand that all those who, having learned about the will of Allah, begin to oppose what Allah has revealed in the Scriptures, begin to argue about the need to observe the Sabbath. Only two groups of people do not fall into disagreements over the Sabbath - those who have never heard the truth about the Sabbath, and those who unquestioningly observe every command of Allah known to them. All others fall into disagreements. And now, specifically for such people, Allah again repeats the Sabbath commandment and orders them to observe it. Otherwise, Allah will judge on the last day, but what will be the result of Allah's judgment on that day? Will it be possible to correct anything in the eternal destiny?

(according to the article by Vasily Yunak).