Moses explains that God and the Israelites make a bargain. God will provide for the Israelites, and they agree to obey all of his commands. From the start, the Israelites do not keep their side of the bargain.
Scripture References: Exodus 19-24, 32-34
Bezalel is the craftsman in charge of making the elaborate Tabernacle. He says that he is very careful to follow God's detailed instructions because the Tabernacle is a pattern of Heaven.
Scripture References: Exodus 25-31, 35-40
Nadab is the son of Aaron, and one of the first Jewish priests. He explains the system of the laws in the book of Leviticus and how important it is to follow them exactly. He should know. He didn't and God killed him.
Scripture References: Leviticus
Caleb explains that the book of Numbers gets its name from the census taken by Moses of the Israelites. He tells of stories in the book , as well as more laws to be followed by the Israelites.
Scripture References: Numbers 1-24