The Exodus (Greek ἔξοδος, exodos “way out”, Narrowly defined, the term refers only to the departure from Egypt described in the Book of Exodus; more widely, it takes in the subsequent law-giving and wanderings in the wilderness between Egypt and Canaan described in the books of Leviticus, Numbers and Deuteronomy.
Date of Exodus. Exodus 12:40, 41.
The marginal date for the Exodus from Egypt is 1491 B.C. According to Exodus 13:4 it was the month of Abib, the first month of the ecclesiastical year of the Hebrews; afterwards called Nisan, and corresponding to our March, or part of April. The Passover lamb was killed the evening of the 14th, or rather “between the two evenings.” (Exodus 12:6, margin). On the 15th at midnight the Israelites were delivered and left Rameses in Egypt for the promised land. (Numbers 33:3). Archaeological discoveries have confirmed the Biblical chronology regarding the date of the Exodus. See New Bible Evidence by Sir Charles Marston, p. 151.
The Book of Exodus tells how Moses leads the Israelites out of Egypt and through the wilderness to Mount Sinai, where God reveals himself and offers them a Covenant: they are to keep his torah (i.e. law, instruction), and in return he will be their God and give them the land of Canaan.