Is the first adhan for Jumu'ah from the practice of 'Uthman (may Allah be pleased with him), and what is its ruling?

Question:
The questioner: In our university residence, they sometimes do not call the first adhan for the Jumu'ah prayer. When asked about it, they said that it is not obligatory, but rather a sunnah (recommended practice), because it was from the practice of 'Uthman ibn 'Affan (may Allah be pleased with him). Is that correct?

Answer:
Yes, 'Uthman ibn 'Affan (may Allah be pleased with him) is one of the Rightly Guided Caliphs; he is the third of the Rightly Guided Caliphs. And the Prophet (peace and blessings be upon him) said: . So it should not be left off, because it is a sunnah (recommended practice), because it is a sunnah (recommended practice). 'Uthman ibn 'Affan (may Allah be pleased with him) established it, and he is one of the Rightly Guided Caliphs, and it is a sunnah (recommended practice) by the testimony of the Prophet (peace and blessings be upon him). Is it not permissible to belittle this adhan?
Some of them used to say it is a bid'ah (religious innovation). Some of them say this is a bid'ah (religious innovation) and consider 'Uthman an innovator. They say that the twenty rak'ahs of tarawih were an innovation by 'Umar, so 'Umar is an innovator. They do not stop at the limit, and may Allah protect us, and they do not honor the Companions, nor do they honor the Rightly Guided Caliphs. They claim that they are scholars and that they are people of the Sunnah, but they do not know the Sunnah. They are not following his saying (peace and blessings be upon him): "Hold fast to my Sunnah and the Sunnah of the Rightly Guided Caliphs after me." And the fact that this is happening in the university, the Imam University and the Islamic University, makes it more severe, because it is supposed that these people teach the people the sunan (recommended practices). So how do they disdain them and leave them off? Yes.