And who is this? Isildur's Heir? It takes more to make a King than a broken Elven blade.
Source: The Lord of the Rings: The Return of the King (2003 New Line film, extended edition)
Notes: The Mouth of Sauron has lied to Frodo's friends, saying that Frodo has been killed. Aragorn angrily draws Andúril (reforged from the shards of Narsil), and decapitates the Mouth of Sauron. The character does not appear in the theatrical release. In the book, he says that Frodo is captured and taken to the Dark Tower, but not killed, and also he is allowed to return through the Gate unmolested, and his fate is unknown.