What is the ruling on one who denies the narration of Ruwais from Ya'qub al-Hadrami?

A person's denial of a certain narration is probable for two reasons: 1. Denying the very existence of the narration due to ignorance of it. The response to this is to prove its existence in scholarly books. 2. Doubting the authenticity of the reading itself. This is forbidden and impermissible, because every reading that conforms to Arabic grammar, matches one of the Uthmanic codices, and has an authentic chain of transmission, is a valid reading that cannot be rejected or denied. Rather, it is one of the seven ahruf (modes of recitation).

The texts of the Imams have converged on declaring one who denies a single letter of the Quran to be an infidel. Whoever disbelieves in a single letter of it has disbelieved in the entire Quran. The point of disbelief here is knowing that it is part of the Quran and insisting on denying it, unlike someone who does not know. One who denies a reading that has not reached the level of tawatur (mass transmission) does not commit disbelief. One who denies a mutawatir reading does not commit disbelief unless they know of its tawatur and then deny it.

As for the three readings that complete the ten (Abu Ja'far, Ya'qub, Khalf), they are mutawatir. The Imams have explicitly stated their tawatur, such as Ibn Al-Jazari, who mentioned that the three readings are mutawatir, received by one group from another, whose agreement upon falsehood is impossible. The readings of these three Imams do not deviate from the readings of the seven except in a few letters. The chains of transmission of the reciters are chains of authentication. Attributing a reading to an Imam does not mean it is exclusive to him; rather, it means he was chosen to represent it due to his frequent recitation of it and dedicating his life to it, along with his trustworthiness and uprightness.