I couldn't find any specific information on "isaidub" related to The Chronicles of Narnia. However, it's possible that you're referring to a dubbed version of the movie in a specific language or a fan-made dub. Sinhala Wal Katha Amp Wela Katha Fixed
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The movie takes place one year after the events of the second film. The Pevensie siblings are transported back to Narnia, where they find that 1,300 years have passed. They join forces with Prince Caspian and sail on the ship Dawn Treader to find the seven lost lords and defeat the evil King Miraz.
The Chronicles of Narnia: The Voyage of the Dawn Treader is the third installment in The Chronicles of Narnia film series. However, I noticed that you mentioned "The Chronicles of Narnia 3 isaidub," which seems to be a search query related to the movie with a possible reference to a dubbing or a specific version.
If you're looking for a specific dubbed version, I recommend checking online platforms like Amazon Prime Video, Netflix, or YouTube, which often provide dubbed versions of popular movies.