Corpus of Electronic Texts Edition
The Gaelic Maundeville (Author: John Maundeville)

paragraph 161

There is a dead sea near that land, and on it grow canes, and at the roots of those canes precious stones are found, and he that beareth one of these stones iron never draws blood upon him, and it doth them no harm, and (therefore) when there is a battle among them, they have weapons of wood, and with this they kill each other.