The people of Israel camped at Mount Sinai for two years. God’s instructions to them while they were there are recorded in Exodus and Leviticus.
God’s instructions that are recorded in Numbers were about preparing to leave Mount Sinai. Moses, Aaron and the leaders of the 12 tribes of Israel counted the people.
First they counted the men 20 years old or older. These were men who could fight in battles. Moses counted the Levite males who were 30 to 50 years old. Moses also counted the males one month old or older in Levi’s tribe.
Then he counted the eldest sons in the other tribes. All Israelite males who were born first in their family belonged to God. The reason for this was explained in Exodus 11:1 – 13:16. This didn’t mean that God wanted the Israelites to sacrifice children. Instead, the Levite males took the place of the eldest sons from other tribes. They did this by being set apart to serve God.
Levite males from Aaron’s family line were set apart to serve God as priests. Others were responsible for taking care of the different parts of the holy tent.
The holy tent was in the centre of the Israelite camp. The tribes were arranged in order around it. First were the Levites who camped closest to the holy tent. Then came the tribe of Judah. They were the lead tribe and had the most soldiers. After that were the other Israelite tribes.
People who were considered unclean couldn’t be near the tent. They couldn’t even stay in the camp. This reminded the Israelites that God is holy and was present with them.