§ Of Beren and Lúthien The Silmarillion

Lúthien was spent, and she had not time nor strength to quell the wolf. But Beren strode forth before her, and in his right hand he held aloft the Silmaril. Carcharoth halted, and for a moment was afraid. 'Get you gone, and fly!' cried Beren; 'for here is afire that shall consume you, and all evil things.' And he thrust the Silmaril before the eyes of the wolf.