Allah's Guarantee

إِنَّا نَحْنُ نَزَّلْنَا ٱلذِّكْرَ وَإِنَّا لَهُۥ لَحَـٰفِظُونَ

Indeed, it is We who sent down the message [i.e., the Qur’ān], and indeed, We will be its guardian.

ثُمَّ إِنَّ عَلَيْنَا بَيَانَهُۥ

Then upon Us is its clarification [to you].