Numbers 33:3-5

3They set out from the city of Rameses in early spring—on the fifteenth day of the first month—on the morning after the first Passover celebration. The people of Israel left defiantly, in full view of all the Egyptians.

4Meanwhile, the Egyptians were burying all their firstborn sons, whom the Lord had killed the night before. The Lord had defeated the gods of Egypt that night with great acts of judgment!

5After leaving Rameses, the Israelites set up camp at Succoth.