It was Groa the Witch, thy Finnish bedmate

"I had no hand. If any did this thing, it was Groa the Witch, thy Finnish bedmate. For the rest, I was mad and know not what I did. But hearken, Asmund: ill shall befall thee and thy house, and I will ever be thy foe. Moreover, I will yet wed this maid of thine. And now, thou Eric, hearken also: I will have another game with thee. This one was but the sport of boys; when we meet again—and the time shall not be long—swords shall be aloft, and thou shalt learn the play of men. I tell thee that I will slay thee, and tear Gudruda, shrieking, from thy arms to be my wife! I tell thee that, with yonder good sword Whitefire, I will yet hew off thy head!"—and he choked and stopped.

H. Rider Haggard: Eric Brighteyes