Many generations after Joseph, a King of Egypt named Pharaoh ordered that all Hebrew baby boys be killed.   To save Moses, his mother built a raft and hid it among some reeds in the Nile River.   The raft with the baby was found by one of Pharaoh's daughters.  Moses grew up as a Prince in the King's household, but he never forgot that his own people, the Hebrews, were slaves.  He prayed often that they be set free.  On one day Moses became so angry over a slave's mistreatment that he killed the Egyptian abuser.   However, Moses' murder act was seen by others, and Moses felt that he had to leave Egypt or he would be arrested and punished.  So for years Moses lived away from his own people.   One day, while in this new land, Moses saw a burning bush.  Exodus chapter 3.
        And Moses said, I will now turn aside, and see this great sight, why the bush is not burnt.4. And when the Lord saw that he turned aside to see, God called unto him out of the midst of the bush, and said, Moses, Moses. And he said, Here am I. 5. And he said, Draw not nigh hither: put off thy shoes from off thy feet, for the place whereon thou standest is holy ground.6. Moreover he said, I am the God of thy father, the God of Abraham, the God of Isaac, and the God of Jacob. And Moses hid his face; for he was afraid to look upon God.7. And the Lord said, I have surely seen the affliction of my people which are in Egypt, and have heard their cry by reason of their taskmasters; for I know their sorrows;8. And I am come down to deliver them out of the hand of the Egyptians, and to bring them up out of that land unto a good land and a large, unto a land flowing with milk and honey; .. 
      So God was going to free the Hebrews from Egypt and give them their own land.  This was around the year 1492 BC - 214 years after Jacob's tribe settled in Goshen.   God asked Moses to be the leader of this escape out of Egypt to freedom (exodus), and Moses made excuses to God about why he shouldn't be the one to be in charge.  It's hard to say "No" to God speaking from a burning bush, so eventually Moses agreed.   
       Pharaoh was not eager to let the slaves go, so God caused disasters (plagues) to happen that convinced the King he should do what Moses was demanding and let the Hebrew people go.  The last plague killed all of the first born sons of Egypt except those who were in houses that were protected by lamb's blood being spread over the doorway. Exodus chapter 12
       For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the Lord.  13. And the blood shall be to you for a token upon the houses where ye are: and when I see the blood, I will pass over you, and the plague shall not be upon you to destroy you, when I smite the land of Egypt.
   The blood protected those who obeyed and applied it as God directed.   When the Angel of Death saw the blood, he would pass over the home without harming anyone.  They were told not only to apply the blood of a perfect lamb, but to also prepare a 'passover' meal.  They had to hurry because they were leaving in the morning.  They could not allow time for the bread they were making to rise before baking.  They would eat unrisen (unleavened) bread at their passover meal.    
    Still, just after the Hebrews left Egypt, Pharaoh had second thoughts, and sent his army to recapture them.  But God parted the Red Sea for Moses and let the Hebrews cross on dry land.   When Pharaoh's army tried to cross, the waters rushed back and drowned them.
      The land the Hebrews crossed into was a desert wilderness called Sinai.  God's plan was for his people, the Hebrews, to cross the Sinai desert and claim the land filled with 'milk and honey'.  This would be the land God gave to their ancestor, Abraham - The Promised Land.   But first the Hebrews had to be prepared.  They had been in Egypt for a long time and had adopted many of the Egyptian's false beliefs and bad actions.  When his chosen people, the Hebrews, returned to true beliefs and good actions - became more holy - God would allow them to cross the Jordan River into 'the promised land'.   God wrote 10 commandments on tablets of stone to instruct His people.  Moses received thes after praying and worshipping 40 days on Mt. Sinai.

The Great Sphinx at Giza, Egypt. An inscription between the paws, the “Dream Stela” or “Sphinx Stella,” tells how Thutmose IV was promised kingship by Harmakhis, god of the Sphinx, even though he was not the first-born son of Amehotep IIB. It is possible that Thutmoses IV’s older brother died in the plague of the first born