Exodus 15:22
So Moses brought Israel from the Red sea, and they went out into the wilderness of Shur; and they went three days in the wilderness, and found no water.
Cross-reference
Exodus 3:18
Prophetic fulfillment
In Exodus 3:18, Moses requests a three-day journey into the wilderness; here that journey is undertaken.
Numbers 33:8
Parallel
In Numbers 33:8, the same three-day journey into the Desert of Etham is recorded as part of Israel's itinerary.
Genesis 16:7
Historical context
Genesis 16:7 identifies the same Desert of Shur where Hagar encountered the angel — the very region Israel now enters after crossing the Red Sea.