Ithamar: Charged with Duties of the Tabernacle
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Numbers 4:28
This is the service of the Gershonite clans at the Tent of Meeting, and their duties shall be under the direction of Ithamar son of Aaron the priest.
Numbers 7:8
and he gave the Merarites four carts and eight oxen, as their service required, all under the direction of Ithamar son of Aaron the priest.