[inscription on the ring:]

Ash nazg durbatulûk, ash nazg gimbatul
ash nazg thrakatulûk, agh burzum-ishi krimpatul

[translation from the black speech:]

One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the Darkness bind them.

See also:
JustSomeLyrics
16
16.27
Barclay James Harvest Hymn (live) Lyrics
U2 bono & The Coors When the stars go blue Lyrics