In Exodus chapter 11, God is telling Moses about the final plague that is going to hit Egypt. The firstborn of every living thing, human and animal, would die around midnight except for the Israelites.
Israel would be protected from this plague for a very specific purpose.
Exo 11:6 And there shall be a great cry throughout all the land of Egypt, such as there was none like it, nor shall be like it any more.
Exo 11:7 But against any of the children of Israel shall not a dog move his tongue, against man or beast: that ye may know how that the LORD doth put a difference between the Egyptians and Israel.
The biggest difference between these people was how much they listened to God.
When we listen to God, we are supposed to be different. A relationship with God should help us produce the fruit of the Spirit, and we should demonstrate that in our lives. Just like the Israelites were different than the Egyptians, we have a similar almost parallel passage in the New Testament that describes Christianity.
1Pe 2:9 But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:
1Pe 2:10 Which in time past were not a people, but are now the people of God: which had not obtained mercy, but now have obtained mercy.
We are called to be different because what we need to do is reflect the light of God rather than try to light up the world by our own merit. That is what the Israelites were supposed to as well. Through their faithfulness, God was going to use them to create a great nation and bring glory to His name.
Everything that happened in Egypt came about to let people realize who God really was, and our mission hasn’t changed whatsoever. As Christians, people are supposed to realize that there is something different about us that isn’t because of who we are.
Mat 5:14 Ye are the light of the world. A city that is set on an hill cannot be hid.
Mat 5:15 Neither do men light a candle, and put it under a bushel, but on a candlestick; and it giveth light unto all that are in the house.
Mat 5:16 Let your light so shine before men, that they may see your good works, and glorify your Father which is in heaven.
Just like everyone was supposed to recognize that the Israelites were different than the Egyptians because they had God with them, we need to act like that in our lives every day. We have God with us.