The Mazdean system, or worship of Ahura Mazda (Ormazd), of which we find in Herodotos positive historical record as an anti-idolatrous and nominally monotheistic creed [210] in the fifth century B.C., is the first to which these aspects can be ascribed with certainty. As the Jews are found represented in the Book of Jeremiah [211] (assumed to have been written in the sixth century B.C.) worshipping numerous Gods with images: and as polytheistic and idolatrous practices are still described in the Book of Ezekiel [212] (assumed to have been written during or after the Babylonian Captivity), it is inadmissible to accept the unauthenticated writings of ostensibly earlier prophets as proving even a propaganda of monotheism on their part, the so-called Mosaic law being known to be in large part of late invention and of Babylonian derivation. [213] In any case, the mass of the people were clearly image-worshippers. The Persians, on the other hand, can be taken with certainty to have had in the sixth century an imageless worship (though images existed for other purposes), with a supreme God set above all others. The Magian or Mazdean creed, as we have seen, was not very devoutly held by Cyrus; but Dareios a generation later is found holding it with zeal; and it cannot have grown in a generation to the form it then bore. It must therefore be regarded as a development of the religion of some section of the "Iranian" race, centering as it does round some deities common to the Vedic Aryans.