"Eorl then stood forth, and taking his spear from his esquire he set it upright in the ground. Then he drew his sword and cast it up shining in the sun, and catching it again he stepped forward and laid the blade upon the mound, but with his hand still about the hilts. He spoke then in a great voice the Oath of Eorl. This he said in the tongue of the Éothéod, which in the Common Speech is interpreted:
Hear now all peoples who bow not to the Shadow in the East, by the gift
of the Lord of the Mundburg we will come to dwell in the land that he
names Calenardhon, and therefore I vow in my own name and on behalf
of the Éothéod of the North that between us and the Great People of
the West there shall be friendship for ever: their enemies shall be our
enemies, their need shall be our need, and whatsoever evil, or threat, or
assault may come upon them we will aid them to the utmost end of our
strength. This vow shall descend to my heirs, all such as may come after
me in our new land, and let them keep it in faith unbroken, lest the
Shadow fall upon them and they become accursed.
Then Eorl sheathed his sword and bowed and went back to his captains.
Cirion then made answer. Standing to his full height he laid his hand upon the tomb and in his right hand held up the white wand of the Stewards, and spoke words that filled those who heard them with awe. For as he stood up the sun went down in flame in the West and his white robe seemed to be on fire; and after he had 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 for ever.
Such an oath had not been heard in Middle-earth since Elendil himself had sworn alliance with Gil-galad King of the Eldar.”
—J.R.R. Tolkien, Unfinished Tales, “Cirion and Eorl” (Cirion the Steward and Eorl the Young swear an eternal alliance between Gondor and Rohan)