An Arabic Quran

S 12:2 We have sent it down as an Arabic quran; perhaps you will comprehend.

Perhaps? Isn't quran supposed to be clear? Why might the reader fail to understand?

S 13:37 And thus have we sent it down as an Arabic precept. And if you follow their desires after what has come to you of knowledge, you have no protector or preserver against Allah.

S 16:103 And we know that they say: Only a human being teaches him. The tongue of the one they refer to is foreign but this is a clear Arabic tongue.

S 20:113 And thus have we sent it down as an Arabic quran and explained in it of the threatening; perhaps they will fear or it will produce a remembrance for them.

S 26:195 In a clear Arabic tongue.

S 39:28 An Arabic quran without crookedness; perhaps they will fear.

S 41:3 A book, its verses detailed, an Arabic quran for people who know,

S 42:7 And thus have we inspired you with an Arabic quran that you may warn the mother of villages and those around it and warn on the day of collection. There is no doubt therein. A party in the Jannah and a party in the blaze.

S 43:3 We have made it an Arabic quran; perhaps you will comprehend.

What does "made it" mean?

S 46:12 And before it is the book of Moses as a guideline and a mercy. And this is a book confirming in Arabic to warn those who have done wrong and good news for the good-doers.

So at this point the book of Moses (the Torah?) is uncorrupted?

Further reading:

Perhaps

A quran?

'This' Quran

The Book Given to Musa and the Tablets