Quran 10:38 from Surah Yunus on Divine Marvels.
أَمۡ يَقُولُونَ ٱفۡتَرَىٰهُۖ قُلۡ فَأۡتُواْ بِسُورَةٖ مِّثۡلِهِۦ وَٱدۡعُواْ مَنِ ٱسۡتَطَعۡتُم مِّن دُونِ ٱللَّهِ إِن كُنتُمۡ صَٰدِقِينَ
English translation: Or (do) they say He has invented it Say Then bring a Surah like it and call whoever you can besides Allah besides Allah besides Allah if you are truthful
Transliteration: am yaquluna if'tarahu qul fatu bisuratin mith'lihi wa-id'u mani is'tata'tum min duni al-lahi in kuntum sadiqina