Heh, now I recognize it!
Lady beloved, whom all Men,
whom Elfinesse, and whom all things
with fur and fell and feathered wings
should serve and love - arise! Away!
Put on thy cloak! Before the day
comes over Nargothrond we fly
to Northern perils, thou and I.
Huan to Luthien.
Didn't you remember, Macalaure, that these were the very first lines that were posted on this thread and that you guessed them yourself?