Translation of the verse 9 from Surah Al-hijr : Number of verses 99 - - page 262 - Part 14.
Verily We: It is We Who have sent down the Dhikr (i.e. the Quran) and surely, We will guard it (from corruption).
Indeed, it is We who sent down the Qur'an and indeed, We will be its guardian.
(15:9) As regards this Admonition, it is We Who have sent it down, and We Ourself will preserve it. *6
*6) That is, "You should note it well that it is We Who have sent this `Word'. Thus it is not Our Messenger whom you are calling `insane' but in fact this abusive remark applies to Us. Moreover, you should know that it is Our 'Word' and We are preserving it; therefore, you can do no harm to it; nor can you discredit it by your ridicules, taunts and objections: nor can you hamper its progress, whatever you may do against it: nor will anyone be ever able to change or tamper with it. "
Source : Al-hijr Verse 9: Indeed, it is We who sent down the Qur'an and indeed, We will be its guardian.