From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
To Prevent from being Wounded.
Whoever digs up St. Peter's root in the morning of St. Peter's day, before the sun rises, and carries these roots around the neck, is sure not to be wounded. But such a person must be careful not to drink liquor while carrying the roots.
Also, whoever digs knot grass, on St. John's day, in the morning before sunrise, and carries the same, will not be wounded.
The grimoire Egyptian Secrets of Albertus Magnus lists this spell.
Timeline of related events
1725Publication of Egyptian Secrets of Albertus Magnus (lists this spell)
1869English-language translation of Egyptian Secrets (lists this spell)