Quran 26:30 from Surah Ash-Shu'araa on Divine Marvels.
قَالَ أَوَلَوۡ جِئۡتُكَ بِشَيۡءٖ مُّبِينٖ
English translation: He said Even if I bring you something manifest
Transliteration: qala awalaw ji'tuka bishayin mubinin