Isaiah 56:3, 6 promises that the sons of strangers will be joined to Yahweh.  Zechariah 2:11 says the same.

In both passages, the verb “join” translates the Hebrew lawah , the verb on which the name “Levi” is a pun.  The prophets are not simply talking about Gentiles becoming distant hangers-on among the covenant people, but about Gentiles becoming joined like the Levites who have been brought near.  They anticipate the priesthood of the plebs.