§ Of the Ruin of Doriath The Silmarillion

But now the rumour ran among the scattered Elves of Beleriand that Dior Thingol's heir wore the Nauglamír, and they said: 'A Silmaril of Fëanor burns again in the woods of Doriath'; and the oath of the sons of Fëanor was waked again from sleep. For while Lúthien wore the Necklace of the Dwarves no Elf would dare to assail her; but now hearing of the renewal of Doriath and of Dior's pride the seven gathered again from wandering, and they sent to him to claim their own.