Translation:

28. (It is) a Qur'an in Arabic without any crookedness (therein): in order that they may guard against Evil.

Notes (Tafseer)

4285. Previous revelations had been in other languages. Now the revelation was given in Arabia in Arabic itself, the language of the country which all could understand. And it is a beautiful language, straight and flexible, and fit to be the vehicle of sublime truths.

4286. See xviii. I and n. 2326. Cf. also vii. 45, n. 1024; and xix. 36, n. 2488.