Judges 18:3

3. They knew the voice of the young man They overheard his conversation, and, looking upon him, they at once recognised him as an old acquaintance. Most commentators understand that the Danites knew by his dialect or mode of pronunciation that he was not an Ephraimite, but the words they knew the voice are not adapted to convey such an idea, and the questions, Who brought thee hither? etc., are the natural language of old acquaintances that have unexpectedly met. And if this Levite was a grandson or great grandson of Moses, the lawgiver of Israel, as appears from Judges 18:30, it is not strange at all that he was personally known to these Danites.