After Moses received the Ten Commandments and some other statutes, God called the people to worship Him. This was before God explained to Moses the principles of His relationship with the people as God revealed this to them later and it was written in the book of Leviticus.
When God called the people to worship, we notice that there are 3 different levels of worship recorded in this important chapter, Exodus 24: 1, 2:
1. The people should not go up the mountain but remain at its foot.
2. Moses, Aaron, Nadab and Abihu, and seventy of the elders of Israel should go up the mountain but remain at a certain distance; they shall worship from afar.
3. Moses alone goes to the top of the mountain.
The first level: worship from the foot of the mountain (refer to verses 4 – 8)
The second level of worship (refer to verses 9 – 11)
The third level of worship (refer to verses 12 – 18)