Abu Ishaq said: “I saw a man asking alAswad bin Yazid, when he was teaching Qur’an in the masjid: “How do recite the verse – (fa hal min muddakir), with a (daal) or a (dhaal)?” He said: “With a (daal)”. I heard Abdullah bin Masood say: “I heard the Messenger of Allah (pbuh) say: “(muddakir) with a (daal)”.” (Muslim).

This narration (and there are countless others similar to them) demonstrates to us that the wordings and verses of the Qur’an have been preserved, and are ONLY accessible to us through the qiraa’aat that have reached us today via the recitations of large groups of people, across generations, without any letters being altered.