Quran 10:37 — Jonah (Younus)

وَما كانَ هٰذَا القُرءانُ أَن يُفتَرىٰ مِن دونِ اللَّهِ وَلٰكِن تَصديقَ الَّذى بَينَ يَدَيهِ وَتَفصيلَ الكِتٰبِ لا رَيبَ فيهِ مِن رَبِّ العٰلَمينَ

This Quran could not possibly be authored by other than GOD. It confirms all previous messages, and provides a fully detailed scripture. It is infallible, for it comes from the Lord of the universe.

[10:36] Most of them follow nothing but conjecture, and conjecture is no substitute for the truth. GOD is fully aware of everything they do.

[10:38] If they say, "He fabricated it," say, "Then produce one sura like these, and invite whomever you wish, other than GOD, if you are truthful."