Quran 3:62 — The Amramites (Ali-'Imran)

Absolutely, this is the narration of the truth. Absolutely, there is no god except GOD. Absolutely, GOD is the Almighty, Most Wise.

[3:61] If anyone argues with you, despite the knowledge you have received, then say, "Let us summon our children and your children, our women and your women, ourselves and yourselves, then let us invoke GOD's curse upon the liars."

[3:63] If they turn away, then GOD is fully aware of the evildoers.