10:37This Quran could not have been produced by anyone other than God. In fact, it is a confirmation of what preceded it, and an elaboration of the Book. There is no doubt about it—it is from the Lord of the Universe.

10:94If you are in doubt about what We revealed to you, ask those who read the Scripture before you. The truth has come to you from your Lord, so do not be of those who doubt.

10:104Say, “O people, if you are in doubt about my religion—I do not serve those you serve apart from God. But I serve God, the one who will terminate your lives. And I was commanded to be of the believers.”