Gandalf’s Riddle of the Ents
The Two Towers, “The Road to Isengard”. Gandalf recited it to Théoden, before they left Helm’s Deep for Isengard, to describe the Ents.
Ere iron was found or tree was hewn,
When young was mountain under moon;
Ere ring was made or wrought was woe,
It walked the forests long ago.