Exodus 13:4-9 "This day came ye out in the month Abib. And it shall be when the LORD shall bring thee into the land of the Canaanites, and the Hittites, and the Amorites, and the Hivites, and the Jebusites, which he sware unto thy fathers to give thee, a land flowing with milk and honey, that thou shalt keep this service in this month. Seven days thou shalt eat unleavened bread, and in the seventh day shall be a feast to the LORD. Unleavened bread shall be eaten seven days; and there shall no leavened bread be seen with thee, neither shall there be leaven seen with thee in all thy quarters. And thou shalt shew thy son in that day, saying, This is done because of that which the LORD did unto me when I came forth out of Egypt. And it shall be for a sign unto thee upon thine hand, and for a memorial between thine eyes, that the LORD'S law may be in thy mouth: for with a strong hand hath the LORD brought thee out of Egypt."
The LORD had promised the land of the Canaanites, Hittites, Amorites, and Jebusites to Abraham, Isaac, and Jacob. Moses was here declaring unto the people the faithfulness of God to His word. He did not say to them “if the LORD shall bring thee into the land. Rather, he declared unto them “when the LORD shall bring thee into the land.”
Just as surely as the LORD had brought them up out of Egypt, He would bring them into the land of promise. It was a good land that flowed with milk and honey. However, the people were to never forget how it was that they came to dwell in this land. They were to observe a yearly reminder of how the LORD had delivered them.
They would hold to the word of God in a mature (perfect) manner. This is signified by the eating of unleavened bread for seven days. Six days it was eaten as the bread of affliction. On the seventh day, it was observed as a holy sabbath unto the Most High God. Not only were they to only eat unleavened bread, but they were to have no leaven in their houses. Today, as believers in the True and Living God, we need to keep the leaven of the world far from our thoughts and attitudes as we labor to serve Him.
This was not only done for their sakes, but for the sakes of the children that would come after them. This was a testimony of what the LORD had done for them in bringing them to the land of promise. Notice that Moses did not tell their children that this is what the LORD will do for you, but rather that this is what the LORD had done for them. In bearing witness of Him today, it is more powerful to testify to others what the LORD has done for us than to try and tell them what He will do for them.
The testimony of the strong hand of the LORD in our lives is to affect what we do and how we live. This is why Moses said it was to be a sign on our hand. The testimony is to affect how we walk and think. This is why Moses said it was to be a memorial between our eyes. The testimony is to affect how we talk and what we talk about. This is the LORD’s law in our mouth. With a strong hand, He has delivered us from Egypt!