LISTEN UP! YOU MAGGOTS! THIS IS THE STORY OF NUMBERS 3! The Lord told Moses and Aaron to count all of the Levites from one month old and older, from all of their families. The Lord said that only the males should be counted. He also said that the Levites had to take the place of the firstborn of all of the Israelites, since the firstborn were dedicated to him. So the Levites were to serve in the tasks of the tabernacle of the Lord. Moses and Aaron did just as the Lord commanded.