Exodus 13

2 All people belong to God and they owe Him respect and submission. For the Israelites, God had spared the firstborn from death, so in a sense they owed Him "double." Later we will see that God will substitute the Levites for the firstborn so that he can have an entire tribe devoted to full-time service and worship to God.
5 God established a memorial celebration so that His people would always remember their release from Egypt.
6 Unleavened bread is bread that is baked before it can rise. When the Israelites left Egypt, they had to prepare food quickly, which did not allow the time needed to allow the bread to rise. During the Passover celebration, they were to remove leavening completely from their households so that there would be no chance of having normal bread.
8 This celebration was meant to provoke questions and be a time of thoughtful remembrance and thanksgiving.

Christian holidays in the West have become highly commercialized, and even pagans can celebrate these holidays without any awareness of the meaning. As individuals, we should celebrate our holidays in such a way that it provokes questions about why the holiday is celebrated. The most important thing is that it opens opportunities for training the next generation, but we should also be able to explain our holidays to others.

9 If you were to get a tattoo (which is not recommended) and you wanted it to be in a prominent location, the forehead and hands would be the best choice. These places are almost never covered and are easily accessible to the eyes of others. The Passover meal was to be a visual sign to outsiders and those within Israel that they are obedient to God. They were also to give verbal confirmation that they know God's Word and obey it.
12 Firstborn animals were to be given to God as sacrifices.
13 Donkeys could not be given as sacrifices because they are later defined as "unclean." A non-firstborn lamb could substitute for a firstborn donkey. If the owner could not or would not redeem the donkey then it was to be killed. It belonged to God, and He has the right to determine what should be done with it.
14 The dedication of the firstborn with these rites should arouse questions. The appropriate answer was to review Israel's history.
17 God knew ahead of time that the Israelites had unstable faith. They had seen God's great miracles, but every time they faced a new challenge, they would "forget" that God was there and able to save them. God already knew that if He lead them into battle immediately that they would lose heart and flee back to Egypt. The incident with the twelve spies would later prove this point. Unfortunately, it would take a long time for the Israelites to learn to trust God.
18 The exodus from Egypt was hasty, but not chaotic.
19 The Pharaoh may have forgotten about Joseph (Exo 1:8), but the people of Israel did not. As Joseph had predicted, Israel would leave Egypt, and had requested that his bones be buried in Canaan (Gen 50:24). Those bones had a long way to travel.
21 Israel had left Egypt at night and needed light to guide them. During the day, they simply needed a reference point to follow.

We are not told how sleeping assignments were made. The camp may have all slept at the same time, or they may have traveled in shifts where one group slept while another group traveled. If the latter were true, then people would be traveling at all hours of the day and night while the camp was on the move. The pillar of cloud and fire would keep them all heading the correct direction.

22 Although God gave them a prominent, visible, powerful, and constant symbol of His presence, Israel would "forget" Him. They had sight, but they did not have faith. Much later, we will see that they develop ritual without faith. Jesus encountered serious problems with people who would see His miracles, but not have faith.