joined unto thee: There is a fine paronomasia in the original. Levi is desired from lawah:, to join, couple, associate; hence Moses says, the Levites yillawoo:, "shall be joined," or associated, with the priests. They shall conjointly perform the sacred office, but the priests shall be principal, the Levites their associates or assistants. Numbers 18:4; Genesis 29:34
minister: Numbers 3:6-9, Numbers 8:19, Numbers 8:22