It does not follow that they had known him before, and recognized his voice, though it may be so. But the Hebrew equally bears the sense that they heard the voice of the Levite; and, attracted by it, went into the chapel Judges 18:18 where Jonathan was. They were probably just starting on their journey, but were still within the court or precincts of Micah’s house. Micah had evidently not told them of his house of God, and his Levite. Their questions indicate surprise.
Related Commentaries of Judges 18:3
Judges 18:3
3 When they were by the house of Micah, they knew the voice of the young man the Levite: and they turned in thither, and said unto him, Who brought thee hither? and what makest thou in this place? and what hast thou here?