Hazrat Shu'ayb narrates that Hazrat Abu Al-'Aliyah used to teach people the Qur'an: So when he intended to correct someone's mistake, he would not say: "It is not like this or that." Rather, he would say: "Recite the verse like this." So I mentioned this to Ibrahim, and he said: "I think your companion has heard this hadith: Whoever denies a single letter of the Qur'an has indeed denied the entire Qur'an."