§ Of Beren and Lúthien The Silmarillion

In the pits of Sauron Beren and Felagund lay, and all their companions were now dead; but Sauron purposed to keep Felagund to the last, for he perceived that he was a Noldo of great might and wisdom, and he deemed that in him lay the secret of their errand. But when the wolf came for Beren, Felagund put forth all his power, and burst his bonds; and he wrestled with the werewolf, and slew it with his hands and teeth; yet he himself was wounded to the death. Then he spoke to Beren, saying: 'I go now to my long rest in the timeless halls beyond the seas and the Mountains of Aman. It will be long ere I am seen among the Noldor again; and it may be that we shall not meet a second time in death or life, for the fates of our kindreds are apart. Farewell!' He died then in the dark, in Tol-in-Gaurhoth, whose great tower he himself had built. Thus King Finrod Felagund, fairest and most beloved of the house of Finwë, redeemed his oath; but Beren mourned beside him in despair.