§ Of Beren and Lúthien The Silmarillion

Then Beren throttled Curufin; but death was near him, for Celegorm rode upon him with a spear. In that hour Huan forsook the service or Celegorm, and sprang upon him, so that his horse swerved aside, and would not approach Beren because of the terror of the great hound. Celegorm cursed both hound and horse, but Huan was unmoved. Then Lúthien rising forbade the slaying of Curufin; but Beren despoiled him of his gear and weapons, and took his knife, sheathless by his side; iron it would cleave as if it were green wood. Then Beren lifting Curufin flung him from him, and bade him walk now back to his noble kinsfolk, who might teach him to turn his valour to worthier use. 'Your horse,' he said, 'I keep for the service of Lúthien, and it may be accounted happy to be free of such a master.'