Al-Mukhtasar
وَلَئِن شِئْنَا لَنَذْهَبَنَّ بِٱلَّذِىٓ أَوْحَيْنَآ إِلَيْكَ ثُمَّ لَا تَجِدُ لَكَ بِهِۦ عَلَيْنَا وَكِيلًا ﴿٨٦﴾
By Allah, if I wanted to take away, O Messenger, the revelation I sent to you by erasing it from the hearts and books, I could take it away, then you would not find anyone to help you and take responsibility to return it.