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 54

Now on the morrow morning, when Cormac arose, he found himself on the green of Tara, with his wife and his son and daughter, and having his Branch and his Cup. Now that was afterwards (called) ‘Cormac's Cup’, and it used to distinguish between truth and falsehood with the Gael. Howbeit, as had been promised him [by Manannan] it remained not after Cormac's death.