Exactly two months after the Israelites left Egypt, they arrived in the wilderness of Sinai.
References for Exodus 19:1
After breaking camp at Rephidim, they came to the wilderness of Sinai and set up camp there at the base of Mount Sinai.
Then Moses climbed the mountain to appear before God. The called to him from the mountain and said, “Give these instructions to the family of Jacob; announce it to the descendants of Israel:
‘You have seen what I did to the Egyptians. You know how I carried you on eagles’ wings and brought you to myself.
Now if you will obey me and keep my covenant, you will be my own special treasure from among all the peoples on earth; for all the earth belongs to me.