Exodus 19:1

In the third month after the Israelites left Egypt--on the very day--they came to the Desert of Sinai.

(New International Version)

In the third month after the sons of Israel had gone out of the land of Egypt, on that very day they came into the wilderness of Sinai.

(New American Standard Bible)

In the third month, when the children of Israel were gone forth out of the land of Egypt, the same day came they into the wilderness of Sinai.

(King James Version)