It betrayed Isildur to his death.
8 seconds sound clip from the The Lord of the Rings: The Fellowship of the Ring movie soundboard.
You can hear this line at 00:05:17 in the Blu-ray version of the movie.
Quote context
[...]
- Isildur, son of the king, took up his father's sword.
- Sauron, the enemy of the Free Peoples of Middle-earth, was defeated.
- The Ring passed to Isildur who had this one chance to destroy evil forever.
- But the hearts of Men are easily corrupted.
- And the Ring of Power has a will of its own.
- It betrayed Isildur to his death.
- It came to me. My own. My love. My own. My precious.
[...]