Hadiths on Seven Modes of the Qur'anic Revelation

The 3 hadiths relate the seven modes (Ahruf): the central text states that «this Qur’an has been revealed in seven different ways» and invites to recite it in the way that is easy; the account of Hudhayfah ibn al-Yaman, alarmed by the difference of recitations between the soldiers of the Levant and Iraq, who came to inform 'Uthman; and the mention of an illiterate nation, from the elderly woman to the man who never reads a book, for whom the recitation was made easy. All three hadiths are authentic.