Qurʔān

Its origins are clearly the Basrah and Kuwfah schools of the 8th century, where the procedures of data analysis and the nature of valid linguistic data from the Qurʔān, the poets, and dialectal authenticity were set.

2006, S.I. Sara, “Ibn Mada’al Qurtubi (1120–1196)”, in Encyclopedia of Language & Linguistics, 2nd edition, volume 5 (Gen–Int), Elsevier, page 454, columns 1–2

It is the language of the Qurʔān and of the Classical Arabic culture, which grants it divine and authoritative indexes, and also the only unifying factor for Arabs all around the world.

2018, Reem Bassiouney, “Identity, repertoire, and performance: The case of an Egyptian poet”, in Reem Bassiouney, editor, Identity and Dialect Performance: A Study of Communities and Dialects (Routledge Studies in Language and Identity), Abingdon, Oxfordshire; New York, N.Y.: Routledge, →ISBN, Part IV (The media, dialect performance, and language variation)