Judges 17:7

We have here an account of Micah's furnishing himself with a Levite for his chaplain, either thinking his son, because the heir of his estate, too good to officiate, or rather, because not of God's tribe, not good enough. Observe, I. What brought this Levite to Micah. By his mother's side he was of the family of Judah, and lived at Bethlehem among his mother's relations (for that was not a Levites' city), or, upon some other account, as a stranger or inmate, sojourned there, Jdg 17:7. Thence he went to sojourn where he could find a place, and in his travels came to the house of Micah in Mount Ephraim, Jdg 17:8. Now, 1. Some think it was his unhappiness that he was under a necessity of removing, either because he was persecuted and abused, or rather neglected and starved, at Bethlehem. God had made plentiful provision for the Levites, but the people withheld their dues, and did not help them into the possession of the cities assigned to them; so that they were reduced to straits, and no care was taken for their relief. Israel's forsaking God began with forsaking the Levites, which therefore they are warned against, Deu 12:19. It is a sign religion is going to decay when good ministers are neglected and at a loss for a livelihood. But, 2.

— Matthew Henry's Concise Commentary (public domain)

Beth-lehem-judah--so called in contradistinction to a town of the same name in Zebulun (Jos 19:15). of the family--that is, tribe. of Judah--Men of the tribe of Levi might connect themselves, as Aaron did (Exo 6:23), by marriage with another tribe; and this young Levite belonged to the tribe of Judah, by his mother's side, which accounts for his being in Beth-lehem, not one of the Levitical cities.

— Jamieson-Fausset-Brown Commentary (public domain)