§ Of the Coming of Men into the West The Silmarillion

Then those that listened sat for a while astounded, and a shadow of fear fell on their hearts; and they resolved to depart far from the lands of the Eldar. But afterwards Amlach returned among them, and denied that he had been present at their debate or had spoken such words as they reported; and there was doubt and bewilderment among Men. Then the Elf-friends said: 'You will now believe this at least: there is indeed a Dark Lord, and his spies and emissaries are among us; for he fears us, and the strength that we may give to his foes.'