Corpus of Electronic Texts Edition
The Irish ordeals, Cormac's adventure in the Land of Promise, and the decision as to Cormac's sword (Author: Unknown)

section 14

Now the steward did not kill the boy, and he durst not take him with him for fear of the king. So he delivered him to the king's cowherd. He went home and declared that to the king and the queen, and (the king) adjudged that the boy should be killed. The king said of him that maen (treachery) would come of him, even of that boy. Wherefore he, the son of Carpre Cennchait, is called ‘Morann mac main.’ A covering of gold and silver was made round that membrane, and thus it became the ‘Collar of [Morann] Mac main’. If he round whose neck it was put were guilty, it would choke him. If, however, he were innocent, it would expand round him to the ground.