Traditional Arabic (fusha) is closest to Modern Standard Arabic. Everyone who said msa or fusha is generally relegated to academic or formal use is not incorrec

Traditional Arabic (fusha) is closest to Modern Standard Arabic. Everyone who said msa or fusha is generally relegated to academic or formal use is not incorrect. But fusha is still widely in use by Muslim scholars (clergy-ish). It is necessary to do an advanced study Islam, Quran and majority of Islamic texts (legal, spiritual, theological) and new texts of a higher academic caliber are still written in fushah today (albeit with voweling)