John Gill Commentary Judges 18:3

"When they were by the house of Micah, they knew the voice of the young man the Levite; and they turned aside thither, and said unto him, Who brought thee hither? and what doest thou in this place? and what hast thou here?" — Judges 18:3 (ASV)

When they were by the house of Micah
At their inn, which might be next to it, or as they were passing by it:

they knew the voice of the young man the Levite ;
who had been in their country, and they had been in his company and conversation, and they knew the tone of his voice when they heard it; a particular brogue he might have. Abarbinel conjectures, that he was singing to Micah's idol, or multiplying his prayers before him:

and they turned in thither ;
into Micah's house, and into the apartment where the young man was;

and said unto him, who brought thee hither ?
they knew he was of Bethlehemjudah; they inquire therefore how he came there, who sent for him, and by what means he was brought to that place:

and what makest thou in this place ?
they knew he was a Levite, and that such an one had no business to minister but at the tabernacle, and therefore they inquire what was his employment here: and what hast thou here? to support himself with, what he had for his maintenance, or how he lived.