In verse 17, God gives the fundamental reason for this feast. It says, “for on this same day I will have brought your armies out of the land of Egypt.” In other words, it is a memorial of God’s deliverance. That’s why God commands this Feast to be observed—to continually remember His deliverance. That’s the foundation. All the other aspects of this Feast build on top of it. The eating of unleavened bread and avoiding leavening are things we do in response, but the reason God gives for the feast is to memorialize His deliverance.
These verses contain something else. Even though rejoicing is not directly mentioned in the instructions, it is still a feast, and so rejoicing is implied. Granted, the food we eat is somewhat unusual compared to what we normally associate with a festive occasion. We have to rejoice without pretzels or pizza or cookies. Instead, our rejoicing includes the bread of affliction, which we will look at later. But nevertheless, this feast is an appointed time for us to remember God’s deliverance, and rejoicing should be the result.
This is a sidenote, but it relates here. We commonly refer to this week as the “Days of Unleavened Bread.” That phrase is only used in two places, both in Acts (Acts 12:3; 20:6). It refers to the time or season in which unleavened bread is used, and that span of time began before the seven-day Feast. But the Bible consistently calls the seven-day observance itself the “Feast of Unleavened Bread,” which shows that it is a time to celebrate. Physical Israel kept this Feast as a memorial of God’s deliverance from Egypt. Spiritual Israel keeps this Feast as a memorial of an even greater, spiritual deliverance.
