From Garmina Gadelica, Vol. IIAn Earnaid Shith
Uainidh mi an earnaid,
le earlaid a bruth,
Chur barrlait air gach ainreit, Fad 's earnaid i.
Earnaid shith, earnaid shith,
Mo niarach an neach dh' am bi,
Ni bheil ni mu iadhadh grein,
Nach bheil di-se le buaidh reidh.
Buainidh mi a chraobh urramach
Bhuain Moire mhor, Mathair chobhair an t-sluaigh,
Chur dhiom gach sgeula sguana, sgulanach
Dim-bith, dim-baigh, dim-buaidh,
Fuailisg, guailisg, duailisg, doilisg,
Gun teid mi dh' an fhuar lie fo'n talamh.
Let's work on a translation. This was collected in the 1800's so older dictionaries are good as the incantation is most likely much older. Take it a line at a time and let's see what we can come up with. Irish speakers are invited to have a go also as I think that the languages were still fairly close at this period.