On the morning of the last day Frodo was alone with Bilbo, and the old hobbit pulled out from under his bed a wooden box. He lifted the lid and fumbled inside.
‘Here is your sword,’ he said. ‘But it was broken, you know. I took it to keep it safe but I’ve forgotten to ask if the smiths could mend it. No time now. So I thought, perhaps, you would care to have this, don’t you know?’
He took from the box a small sword in an old shabby leathern scabbard. Then he drew it, and its polished and well-tended blade glittered suddenly, cold and bright. ‘This is Sting,’ he said, and thrust it with little effort deep into a wooden beam.

Book 2, Chapter 3 The Ring Goes South