HAG STONE
A hag stone is in folk magic, a stone with a hole in it hung in homes and stables to keep away hAgs or witches, at night. Hung on the bedpost, a hag stone is believed to prevent a hag from riding one’s chest and causing a Nightmare. In the stables, it prevents a hag from taking the horses and riding them all night to the point of exhaustion. See also : stones.
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SOURCE:
The Encyclopedia of Witches, Witchcraft and Wicca – written by Rosemary Ellen Guiley – Copyright © 1989, 1999, 2008 by Visionary Living, Inc.