IBN-ABBASS has narrated that: ``VAHAB-IBN-ZAID and RÄFER-IBN-HARMALIH came to the prophet and said: If you get a letter from our Lord being addressed to us, so that we may read it, or if you make us streams of water to flow, we shall believe that you are a true prophet! To answer them it revealed: ``Do you want to ask your prophet as Moses was questioned before? But whoever changes from faith to unbelief, has of surety strayed from the even way. (OF NATURE AND CREATION)