During the Lost Season 4 Finale there was a creepy dream scene that involved Kate and Claire. Claire told Kate that she could not take Aaron back to the island.
Earlier in that scene Kate received a phone call. It was someone speaking backwards.
The voice (sounding like Jack or Christian) says “The island needs you. You have to go back before it’s too late.”
Check out the audio file at The Tail Section.
Image used with permission from Newscom

Many thought it sounded like either Locke or Sawyer.
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