For Turgon towering in terrible anger
a pathway clove him with his pale sword-blade
out of that slaughter - yea, his swath was plain
through the hosts of Hell like hay that lieth
all low on the lea where the long scythe goes.

(HoME III, The Lays of Beleriand, Túrin Son of Húrin & Glorund the Dragon, 31-35)

There were bones on the floor and a nasty smell was in the air; but there was a good deal of food jumbled carelessly on shelves and on the ground, among an untidy litter of plunder, of all sorts from brass buttons to pots full of gold coins standing in a corner. There were lots of clothes, too, hanging on the walls-too small for trolls, I am afraid they belonged to victims-and among them were several swords of various makes, shapes, and sizes. Two caught their eyes particularly, because of their beautiful scabbards and jewelled hilts. Gandalf and Thorin each took one of these; and Bilbo took a knife in a leather sheath. It would have made only a tiny pocket-knife for a troll, but it was as good as a short sword for the hobbit.
"These look like good blades," said the wizard, half drawing them and looking at them curiously. "They were not made by any troll, nor by any smith among men in these parts and days; but when we can read the runes on them, we shall know more about them."

(The Hobbit, Ch. 2, Roast Mutton)

Elrond knew all about runes of every kind. That day he looked at the swords they had brought from the trolls' lair, and he said: "These are not troll-make. They are old swords, very old swords of the High Elves of the West, my kin. They were made in Gondolin for the Goblin-wars. They must have come from a dragon's hoard or goblin plunder, for dragons and goblins destroyed that city many ages ago. This, Thorin, the runes name Orcrist, the Goblin-cleaver in the ancient tongue of Gondolin; it was a famous blade. This, Gandalf, was Glamdring, Foe-hammer that the king of Gondolin once wore. Keep them well!"
"Whence did the trolls get them, I wonder?" said Thorin looking at his sword with new interest.
"I could not say," said Elrond, "but one may guess that your trolls had plundered other plunderers, or come on the remnants of old robberies in some hold in the mountains of the North. I have heard that there are still forgotten treasures of old to be found in the deserted caverns of the mines of Moria, since the dwarf and goblin war."

(The Hobbit, Ch. 3, A Short Rest)

He took out his sword again, and again it flashed in the dark by itself. It burned with a rage that made it gleam if goblins were about; now it was bright as blue flame for delight in the killing of the great lord of the cave. It made no trouble whatever of cutting through the goblin-chains and setting all the prisoners free as quickly as possible. This sword's name was Glamdring the Foe-hammer, if you remember. The goblins just called it Beater, and hated it worse than Biter if possible.

(The Hobbit, Ch. 4, Over Hill and Under Hill)

Gandalf bore his staff, but girt at his side was the elven-sword Glamdring, the mate of Orcrist that lay now upon the breast of Thorin under the Lonely Mountain.

(LoTR, II-3)

Gandalf walked in front as before. In his left hand he held up his glimmering staff, the light of which just showed the ground before his feet; in his right he held his sword Glamdring. Behind him came Gimli, his eyes glinting in the dim light as he turned his head from side to side. Behind the dwarf walked Frodo, and he had drawn the short sword, Sting. No gleam came from the blades of Sting or of Glamdring; and that was some comfort, for being the work of Elvish smiths in the Elder Days these swords shone with a cold light, if any Orcs were near at hand.

(LoTR, II-4)

Feet were coming down the corridor. There was a ring and clatter as the Company drew their swords. Glamdring shone with a pale light, and Sting glinted at the edges.
...
The Balrog reached the bridge. Gandalf stood in the middle of the span, leaning on the staff in his left hand, but in his other hand Glamdring gleamed, cold and white. His enemy halted again, facing him,...
...
still Gandalf could be seen, glimmering in the gloom; he seemed small, and altogether alone: grey and bent, like a wizened tree before the onset of a storm. From out of the shadow a red sword leaped flaming. Glamdring glittered white in answer. There was a ringing clash and a stab of white fire. The Balrog fell back and its sword flew up in molten fragments. The wizard swayed on the bridge, stepped back a pace, and then again stood still.

(LoTR, II-5)

Here at least is my sword, goodman Háma. Keep it well. Glamdring it is called, for the Elves made it long ago. Now let me pass.

(LoTR, III-5)

And Gandalf, too, was now riding on his tall grey horse, all clad in white with a great mantle of blue and silver over all, and the long sword Glamdring at his side.

(LoTR, VI-7)

hoth - 'host, horde' (nearly always in a bad sense) in Tol-in-Gaurhoth; also in Loss(h)oth, the Snowmen of Forochel (The Lord of the Rings Appendix A [I, iii]) and Glamhoth 'din-horde', a name for Orcs.

(Silm, Appendix)

A company of Orcs was encamped in the midst of the road, huddled about a large wood-fire. "Gurth on Glomhoth" Tuor muttered. [18] "Now the sword shall come from under the cloak.

[18] "Death to the Glamhoth"' This name, though it does not occur in The Silmarillion or in The Lord of the Rings, was a general term in the Sindarin language for Orcs. The meaning is "din-horde," "host of tumult"; cf. Gandalf's sword Glamdring, and Tol-in-Gaurhoth, the Isle of (the host of )Werewolves.

(UT, Of Tuor and his Coming to Gondolin)