During the night Pharaoh summoned Moses and Aaron and said, “Up! Leave my people, you and the Israelites! Go, worship the Lord as you have requested

Exodus 12-13

The animals you choose must be year-old males without defect, and you may take them from the sheep or the goats. Take care of them until the fourteenth day of the month, when all the members of the community of Israel must slaughter them at twilight. Then they are to take some of the blood and put it on the sides and tops of the doorframes of the houses where they eat the lambs. That same night they are to eat the meat roasted over the fire, along with bitter herbs, and bread made without yeast.

On that same night I will pass through Egypt and strike down every firstborn of both people and animals, and I will bring judgment on all the gods of Egypt. I am the Lord.

At midnight the Lord struck down all the firstborn in Egypt, from the firstborn of Pharaoh, who sat on the throne, to the firstborn of the prisoner, who was in the dungeon, and the firstborn of all the livestock as well. Pharaoh and all his officials and all the Egyptians got up during the night, and there was loud wailing in Egypt, for there was not a house without someone dead.

During the night Pharaoh summoned Moses and Aaron and said, “Up! Leave my people, you and the Israelites! Go, worship the Lord as you have requested. Take your flocks and herds, as you have said, and go. And also bless me.”

The Lord said to Moses, “Consecrate to me every firstborn male. The first offspring of every womb among the Israelites belongs to me, whether human or animal.”

All the firstborn males of your livestock belong to the Lord. Redeem with a lamb every firstborn donkey, but if you do not redeem it, break its neck. Redeem every firstborn among your sons.

Moses took the bones of Joseph with him because Joseph had made the Israelites swear an oath. He had said, “God will surely come to your aid, and then you must carry my bones up with you from this place.”

Why?

Finally, Israelite end their journey in Egypt, and the Lord performed great things that let them know the Lord is greater than their gods.

For the Lord killed the firstborn in Egypt, so the Lord asked Israelite know that the firstborn of every womb among the Israelites belonged to the Lord.

How?

The Lord let the Israelites get out of Egypt through Moses. So, we need to walk in the way the Lord leads us.