'For as [Cirion] stood up the sun went down in flame in the West…and after he vowed that Gondor should be bound by a like bond of friendship and aid in all need, he lifted up his voice and said in Quenya:
Vanda sina termaruva Elenna.nóreo alcar enyalien ar Elendil Vorondo voronwë. Nai tiruvantes i hárar mahalmassen mi Númen ar i Eru i or ilyë mahalmar eä tennoio.
And again he said in the Common Speech:
This oath shall stand in memory of the glory of the Land of the Star, and of the faith of Elendil the Faithful, in the keeping of those who sit upon the thrones of the West and of the One who is above all thrones forever.’ - Cirion and Eorl, Unfinished Tales.
The Oath of Cirion and Eorl, by Anke Eissmann