37. Safat · verses 156–157

أَمۡ لَكُمۡ سُلۡطَٰنٞ مُّبِينٞ

Am lakum sultanun mubeenun

Or have ye an authority manifest?

فَأۡتُواْ بِكِتَٰبِكُمۡ إِن كُنتُمۡ صَٰدِقِينَ

Fatoo bikitabikum in kuntum sadiqeena

Then bring ye your Book (of authority) if ye be truthful!