Quran 11:14 — Hud (Hud)

فَإِلَّم يَستَجيبوا لَكُم فَاعلَموا أَنَّما أُنزِلَ بِعِلمِ اللَّهِ وَأَن لا إِلٰهَ إِلّا هُوَ ۖ فَهَل أَنتُم مُسلِمونَ

If they fail to meet your challenge, then know that this is revealed with GOD's knowledge, and that there is no god except He. Will you then submit?

[11:13] If they say, "He fabricated (the Quran)," tell them, "Then produce ten suras like these, fabricated, and invite whomever you can, other than GOD, if you are truthful."*

[11:15] Those who pursue this worldly life and its material vanities, we will pay them for their works in this life, without the least reduction.