Before the people can move forward in the journey they have to learn about and experience the holiness of God.
Exodus 19:2-8
They traveled from Rephidim, came to the Sinai Wilderness, and camped in the wilderness. Israel camped there in front of the mountain.
3 Moses went up the mountain to God, and the Lord called to him from the mountain: “This is what you must say to the house of Jacob and explain to the Israelites: 4 ‘You have seen what I did to the Egyptians and how I carried you on eagles’ wings and brought you to myself. 5 Now if you will carefully listen to me and keep my covenant, you will be my own possession out of all the peoples, although the whole earth is mine, 6 and you will be my kingdom of priests and my holy nation.’ These are the words that you are to say to the Israelites.”
7 After Moses came back, he summoned the elders of the people and set before them all these words that the Lord had commanded him. 8 Then all the people responded together, “We will do all that the Lord has spoken.” So Moses brought the people’s words back to the Lord.