After they had set out from Rephidim, they entered the Wilderness of Sinai, and Israel camped there in front of the mountain.
Here is, I. The date of that great charter by which Israel was incorporated. 1. The time when it bears date (Exo 19:1) - in the third month after they came out of Egypt. It is computed that the law was given just fifty days after their coming out of Egypt, in remembrance of which the feast of Pentecost was observed the fiftieth day after...
Commenting on Exodus 19:1-8
For they were departed from Rephidim,.... After they had fought with Amalek, and came to the western part of the mount to Horeb, where the rock was smitten for them; and they were come from that now, and encamped at Sinai, after Jethro had paid a visit to Moses: and were come to the desert of Sinai, and had pitched in this wilderness; that is...
were come to the desert of Sinai--The desert has its provinces, or divisions, distinguished by a variety of names; and the "desert of Sinai" is that wild and desolate region which occupies the very center of the peninsula, comprising the lofty range to which the mount of God belongs.