Quran 52:34 from Surah At-Tur on Divine Marvels.
فَلۡيَأۡتُواْ بِحَدِيثٖ مِّثۡلِهِۦٓ إِن كَانُواْ صَٰدِقِينَ
English translation: Then let them bring a statement like it if they (are) truthful
Transliteration: falyatu bihadithin mith'lihi in kanu sadiqina