Exodus 13:2  “…Consecrate to Me all the firstborn, whatever opens the womb…”
If not mistaken, I think there is a sacrifice that is offered to “buy back” the firstborn, or otherwise account for the firstborn to God.  Will have to make note of that and check later.  May not be until Leviticus or Deuteronomy.

3  “…Remember this day in which you went out of Egypt…No leavened bread shall be eaten”
The Feast of Unleavened Bread to commemorate leaving Egypt.  In the month of Nisan.  No leaven allowed anywhere.  On the fourteenth day of the month, the day of the Passover, the Feast begins.  They eat unleavened bread for seven days and have a feast on the seventh day or twenty-first of the month.

9  “…a sign to you on your hand and as a memorial between your eyes…”
Reference to the phylacteries, the little boxes worn on the wrists and forehead which held small bits of parchments containing the law.  Keeping the law with them and incorporating it into their daily lives.

13  “…all the firstborn of man among your sons you shall redeem”
Here’s the explanation to what was mentioned in verse 2.  All the firstborn of man and beast were set aside to the Lord.  And the animals were sacrificed, clean ones anyway.  All except donkeys which could be redeemed with a lamb, otherwise they had their necks broken.  For man, you did the same thing, redeemed them.  This was to commemorate that God redeemed or saved the firstborns in Egypt by killing the Passover lamb.  Therefore, they all belong to Him.  This and the other memorials were to remind the people of what happened, how the LORD saved them and brought them out of Egypt.  And they were supposed to use them to teach future generations.

17  “… God did not lead them by way of the land of the Philistines, although that was near…”
God always deals with us according to our weaknesses.  And although He could speak the words and do things immediately, He chooses to work with us in our humanness.  He could have sent the Israelites straight up to Canaan.  Would have only taken a few days.  But He knew they could not handle dealing with the Philistines in their current state, so He took them the long way around.  He would take the time to train them and teach them rather than just give them what they needed.  There are things I know I need in my life, things I wish I had now.  Like patience.  But God won’t just grant them to me.  He takes the time to teach me, has me go through trials and lessons.  Take the human route.  He does the teaching, and I have to look to Him, but He works with me according to my weakness.  And it still boggles my mind as to why He chooses to do things that way.  The only thing I can come up with is that He created this physical universe and placed us in it, and He wants to do things according to the laws He’s put in place.  He can bend the rules and override the standards any time He pleases, but most of the time He chooses not to.  I can only imagine how things would have been had man not sinned.  Will be so wonderful when they are like that again.

18  “…the children of Israel went up in orderly ranks…”
Another reason they are referred to as armies.  They probably left by tribe.  Not bad for such a large mass of people.

19  “…Moses took the bones of Joseph with him…”
Joseph knew the Egyptians would want to embalm and bury him according to their traditions since he’d done so much for the country.  But he also knew God would bring the Israelites back to Canaan some day and wanted to be sure he was buried there eventually.

21  “…the LORD went before them by day in a pillar of cloud to lead the way, and by night in a pillar of fire…”
They were led by God both day and night.  We get caught up in the cloud and fire, but the important thing is God was doing the leading.  He did what it took to lead His people.  And it doesn’t say this, but I wonder if it was also to remind the people He was leading and not Moses.  Moses was at the head of the crowd, but they could see God in the air above them.

I hope you enjoy reading and studying His word.  May it accomplish what He desires.  Please feel free to comment or post questions.  Thanks for reading!

Scripture taken from the New King James Version®. Copyright © 1982 by Thomas Nelson. Used by permission. All rights reserved.