12 Because I will pass through the land of Egypt that night, and I will strike all the firstborn in the land of Egypt, both man and beast; and I will condemn all the gods of Egypt. I am the LORD. 13 The blood will be a sign for you, on the houses where you are. And when I see the blood, I will pass over you, and no plague will come upon you to destroy you, when I strike the land of Egypt. 14 “This day will be for you a memorial day, and you will keep it as a feast to the LORD; throughout your generations, as a statute forever, you will keep it as a feast. 15 Seven days you will eat unleavened bread. On the first day you will remove leaven out of your houses, because if anyone eats what is leavened, from the first day until the seventh day, that person will be cut off from Israel. 16 On the first day you will hold a holy assembly, and on the seventh day a holy assembly. No work will be done on those days. But what everyone needs to eat, that alone may be prepared by you. 17 And you will observe the Feast of Unleavened Bread, because on this very day I brought your armies out of the land of Egypt. Because of this, you will observe this day, throughout your generations, as a decree forever. 18 In the first month, from the fourteenth day of the month at evening, you will eat unleavened bread until the twenty-first day of the month at evening. 19 For seven days no leaven is to be found in your houses. If anyone eats what is leavened, that person will be cut off from the congregation of Israel, whether he is a sojourner or a native of the land. 20 You will eat nothing leavened; in all your dwelling places you will eat unleavened bread.”
signs for the believers
Signs are proof of the power of God. They are meant for believers to honor as demonstrations of their faith. The Passover was to be a celebration reminding the Israelites that on that night, the LORD decisively condemned the gods of the Egyptians, and rescued his people from their power.
One of those signs was a Hebrew letter, painted on the doorframes of their houses. It stood for a word. Nobody today knows what that word was. It could have been the word for grace, or the word for life. Whatever it said, it was God’s way of saying “I choose to rescue you.”
The other sign was the absence of leaven. Leavening bread was normal for Jewish people. But God told them to set aside a few days to rid their homes of the stuff. They would have to rid their lives of all the things about those condemned foreign gods in that foreign land. The leaven served as a sign of those things. Rescue takes consecration. The LORD is not just taking them out of Egypt. He is taking Egypt out of them.
LORD, thank you for rescuing us from sin, and restoring us to right relationship with you. May we visibly demonstrate to the world around us that you have condemned its gods, and we belong to you, not them.
 A painted doorframe would display the Hebrew letter chet.