The Materials Used

21 These are the amounts of the materials used for the tabernacle, the tabernacle of the covenant law, which were recorded at Moses’ command by the Levites under the direction of Ithamar son of Aaron, the priest.

Read Exodus 38:21 Using Other Translations

This is the sum of the tabernacle, even of the tabernacle of testimony, as it was counted, according to the commandment of Moses, for the service of the Levites, by the hand of Ithamar, son to Aaron the priest.
These are the records of the tabernacle, the tabernacle of the testimony, as they were recorded at the commandment of Moses, the responsibility of the Levites under the direction of Ithamar the son of Aaron the priest.
This is an inventory of the materials used in building the Tabernacle of the Covenant. The Levites compiled the figures, as Moses directed, and Ithamar son of Aaron the priest served as recorder.