Most native Arabic speakers will be able to understand large chunks of the Qur'an. There are some words / phrases in the Qur'an that wouldn't be used in modern

Most native Arabic speakers will be able to understand large chunks of the Qur'an. There are some words / phrases in the Qur'an that wouldn't be used in modern Arabic that might prove challenging for those who don't engage with the Qur'an on a regular basis, but the Arabic of the Qur'an is very close to that of MSA. To most Arab speakers, both Classical Arabic and MSA are simply referred to as Fusha. There are also many non-speakers of Arabic who understand many verses and can pick up on the gist of many verses in the Qur'an.