Quran 18:56 from Surah Al-Kahf on Divine Marvels.
وَمَا نُرۡسِلُ ٱلۡمُرۡسَلِينَ إِلَّا مُبَشِّرِينَ وَمُنذِرِينَۚ وَيُجَٰدِلُ ٱلَّذِينَ كَفَرُواْ بِٱلۡبَٰطِلِ لِيُدۡحِضُواْ بِهِ ٱلۡحَقَّۖ وَٱتَّخَذُوٓاْ ءَايَٰتِي وَمَآ أُنذِرُواْ هُزُوٗا
English translation: And not We send the Messengers except (as) bearers of glad tidings and (as) warners And dispute those who disbelieve with falsehood to refute thereby the truth And they take My Verses and what they are warned (in) ridicule
Transliteration: wama nur'silu al-mur'salina illa mubashirina wamundhirina wayujadilu alladhina kafaru bil-batili liyud'hidu bihi al-haqa wa-ittakhadhu ayati wama undhiru huzuwan