§ Of the Noldor in Beleriand The Silmarillion

It was not long before whispered tales began to pass among the Sindar concerning the deeds of the Noldor ere they came to Beleriand. Certain it is whence they came, and the evil truth was enhanced and poisoned by lies; but the Sindar were yet unwary and trustful of words, and (as may well be thought) Morgoth chose them for this first assault of his malice, for they knew him not. And Círdan, hearing these dark tales, was troubled; for he was wise, and perceived swiftly that true or false they were put about at this time through malice, though the malice he deemed was that of the princes of the Noldor, because of the jealousy of their houses. Therefore he sent messengers to Thingol to tell all that he had heard.