For they were departed— Houbigant renders this, For they had departed from Rephidim, that they might come into the wilderness of Sinai, and encamp there: there, therefore, Israel encamped before the Mountain.
Related Commentaries of Exodus 19:2
Exodus 19:2
2 For they were departed from Rephidim, and were come to the desert of Sinai, and had pitched in the wilderness; and there Israel camped before the mount.