Fiqh-us-Sunnah Volume 2, Supererogatory Prayer, Fiqh 2.127A.
Section : It is disliked to raise one’s voice while reciting al-Kahf in the mosque on Friday.
Shaikh Muhammad ‘Abdu issued a verdict that mentioned reciting Surah al-Kahf aloud among the many disliked matters on Friday. He also mentioned the following: singling out Friday as a day of fasting, singling out its night as a night to perform salatul tahajjud, reciting Surah al-Kahf during it with a specific manner of melody which disturbs those who are offering salah, while the people in the mosque are not listening because of their being engaged in conversation with others. Therefore, one should be careful about such a recital.