"'"You still set yourself against my people and will not let them go. Therefore, at this time tomorrow I will send the worst hailstorm that has ever fallen on Egypt, from the day it was founded until now. Give an order now to bring your livestock and everything you have in the field to a place of shelter, because the hail will fall on every person and animal that has not been brought in and is still out in the field, and they will die."'" NIV translation
The warning to Pharaoh continues and we see that he and all of the people of Egypt are given a choice. They can either believe God and bring in their livestock or they can choose to doubt and let them die. There is no middle ground and each one had to make their own decision. The Israelites would have been seen bringing their livestock in for shelter and the Egyptians had the same choice.
This was a picture of the fact that God was going to deal with people on an individual basis for salvation. We also see that this salvation was going to be extended to Gentiles as well as to the Jewish people. It is an individual decision to accept the fact that Jesus is the Son of God and the payment for our sins. If we do not enter into the shelter of that faith, we will all face death (separation from God) and everlasting torture in the depths of hell.
"Those officials of Pharaoh who feared the word of the Lord hurried to bring their slaves and their livestock inside. But those who ignored the word of the Lord left their slaves and livestock in the field." NIV translation
We see from this passage that some of the Egyptians believed the word of God and brought in their slaves and livestock while others refused. We are reminded that this was not an uninformed decision as they had the examples of the plagues that had already passed.
This is a picture of what will happen in the last days. There will be all kinds of plagues and they will be visible to all. Each person will have to decide if they believe the word of God or not. Those that do can take shelter in Jesus while those that do not will be judged and the sentence will be death.