Quran 44:50 from Surah Ad-Dukhaan on Divine Marvels.
إِنَّ هَٰذَا مَا كُنتُم بِهِۦ تَمۡتَرُونَ
English translation: Indeed this (is) what you used (to) [about it] doubt
Transliteration: inna hadha ma kuntum bihi tamtaruna