Exodus 40 describes the instructions given by God to Moses for setting up the tabernacle, which was to occur on the first day of the first month, one year after the Israelites' exodus from Egypt. Moses is commanded to arrange the tabernacle and its furnishings, consecrate them with holy oil, and anoint Aaron and his sons as priests. The chapter culminates in the glory of the Lord filling the tabernacle, signifying His presence among His people.