Tongu-sa fom chumachta 7 tar in mac n-óengine.

Tongu-sa fom chumachta 7 tar in mac n-óengine.

(I swear * under my * powers * & * by * the * son * one-born)

I swear by my powers and by the only-begotten son.

An oath quoted in DIL (s.v. "tongaid" and "tar"). A similar ecclesiastical oath from "Páis Georgi" in "The Passions and Homilies from Leabhar Breac" is "Toingim torum fen, & tar mh' aingli" (I swear by myself and by my angels).