'If none can release us,' said Maglor, 'then indeed the Everlasting Darkness shall be our lot, whether we keep our oath or break it, but less evil shall we do in the breaking.' Yet he yielded at last to the will of Maedhros, and they took counsel together how they should lay hands on the Silmarils. And they disguised themselves, and came in the night to the camp of Eonwe, and crept into the place where the Silmarils were guarded, and they slew the guards, and laid hands on the jewels.
Quenta Silmarillion, Chapter XXIV, Of the Voyage of Earendil, The SilmarillionAnd it is told of Maglor that he could not endure the pain with which the Silmaril tormented him; and he cast it at last into the Sea, and thereafter he wandered ever upon the shores, singing in pain and regret beside the waves. For Maglor was mighty among the singers of old, named only after Daeron of Doriath; but he never came back among the people of the Elves.
But as they drew near to the further gate, Frodo saw a dark ill-kept house behind a thick hedge; the last house in the village. In one of the windows he caught a glimpse of a sallow face with sly, slanting eyes; but it vanished at once.
The Fellowship of the Ring, Book I, Chapter 11, A Knife in the Dark
FotR, Bk2, Ch1, Many MeetingsWhat!' cried Bilbo. 'You can't tell which parts were mine, and which were the Dúnadan's?' 'It is not easy for us to tell the difference between two mortals' said the Elf.
'Nonsense, Lindir,' snorted Bilbo. 'If you can't distinguish between a Man and a Hobbit, your judgement is poorer than I imagined. They're as different as peas and apples.'