After he died, the Oracle prophesied his return and that his coming would hail the destruction of the Matrix.
11 seconds sound clip from the The Matrix movie soundboard.
You can hear this line at 00:45:44 in the Blu-ray version of the movie.
Quote context
[...]
- I've seen it before, and I'm sorry.
- I did what I did because, I had to.
- It was he who freed the first of us... taught us the truth.
- As long as the Matrix exists the human race will never be free.
- End the war. Bring freedom to our people.
- I did what I did because I believe that search is over.
- Get some rest. You're going to need it.
- Morning. Did you sleep? You will tonight. I guarantee it.
[...]