Line 7 of O'Curry's rendering of the first stanza should run: "So that he may take the point of a weapon through him."
Stanza 2 of the poem should run thus:
It would be better for thee to stay, thy threats will not be gentle,
there will be some one who shall have sickness on that account, distressful will be thy departure
to encounter the Rock of Ulster;
and ill may this venture turn out;
long will be the remembrance of it, woe shall be to him who goeth that journey.
Line 4 of the next stanza, "I will not keep back to please you."