Quran 7:106 from Surah Al-A'raaf on Divine Marvels.
قَالَ إِن كُنتَ جِئۡتَ بِـَٔايَةٖ فَأۡتِ بِهَآ إِن كُنتَ مِنَ ٱلصَّٰدِقِينَ
English translation: He said If you have come with a Sign then bring it if you are of the truthful
Transliteration: qala in kunta ji'ta biayatin fati biha in kunta mina al-sadiqina