(A Quran in Arabic, free from any crookedness) meaning: there is [no crookedness in it], (that they may have Taqwa) so that they may fear Allah.

Muhammad said: (Arabic) is in the accusative case as a state (hal). The meaning is: We have set forth for people in this Quran, in the state of its Arabic language and its clarity, and he mentioned (a Quran) as an emphatic confirmation.