John Gill Commentary Deuteronomy 18:7

"then he shall minister in the name of Jehovah his God, as all his brethren the Levites do, who stand there before Jehovah." — Deuteronomy 18:7 (ASV)

And he shall minister in the name of the Lord his God
The Targum of Jonathan is, ``he shall minister in the name of the Word of the Lord his God;'' in the name of Christ, as a type of him, as every priest and every sacrifice were: he was to be allowed to officiate, though it was not his course or turn:

as all his brethren the Levites do, which stand there before the Lord ;
daily offering the same sacrifices, and whatever are brought unto them; who might be said to stand before the Lord, because they stood at the altar of the Lord, and offered the sacrifices of the people to him; and a country Levite or priest was to be admitted to do the same thing at Jerusalem, and in the temple there, as they did; and this shows that a priest is meant by the Levite.