What is the ruling on reciting the Qur’an with more than one recitation (qira'ah) in a single rak'ah during a loud prayer?

It is forbidden for a Muslim to say "it is not permissible" regarding something whose prohibition is not known from the Qur'an or Sunnah, due to the Almighty's saying: "And do not pursue that of which you have no knowledge." The sayings of the jurists have varied regarding the ruling on combining more than one recitation (qira'ah) in prayer; some have permitted it, while others have deemed it reprehensible.

Al-Shirbini al-Shafi'i mentioned in "Mughni al-Muhtaj" that if one begins with the recitation of one of the reciters, it is preferable to continue with it as long as the discourse is connected. However, if its connection ends, one may recite with the recitation of one of the seven, though continuing with the first is better.

Al-Jassas said in "Ahkam al-Qur'an" that no one is obliged to recite with the recitation of a single person. Rather, it is permissible for one to recite Al-Fatihah and articulate its letters according to three different recitations, because all of them are Qur'an.

As for Ibn Taymiyyah, he was asked about combining the seven recitations: Is it a Sunnah or an innovation? He replied that combining them in prayer or recitation is a reprehensible innovation. It is better for the Imam to complete the recitation with a single qira'ah to prevent discord and dispute among the congregants.