Numbers 18:2

That they may be joined unto thee. — There is an allusion here to the meaning of the name Levi, which was given to Leah’s third son. (See Genesis 29:34.) The Hebrew verb is the same as that which occurs in the speech of Leah.

And minister unto thee: but thou and thy sons... — Or, and they shall minister unto thee, both unto thee and to thy sons with thee, before the tent of witness. The service of the Levites was executed before the tent — i.e., in the court; that of the priests was in the holy place, as well as in the court (Numbers 18:7).