Jamieson, Fausset and Brown on Numbers 6:23-27

Nu 6:23-27. The Form of Blessing the People.

23-27. Speak unto Aaron and unto his sons, saying, On this wise ye shall bless the congregation of Israel, &c.--This passage records the solemn benediction which God appointed for dismissing the people at the close of the daily service. The repetition of the name "Lord" or "Jehovah" three times, expresses the great mystery of the Godhead--three persons, and yet one God. The expressions in the separate clauses correspond to the respective offices of the Father, to "bless and keep us"; of the Son, to be "gracious to us"; and of the Holy Ghost, to "give us peace." And because the benediction, though pronounced by the lips of a fellow man, derived its virtue, not from the priest but from God, the encouraging assurance was added, "I the Lord will bless them."