Pertaining to the Passover, and the Feast of Unleavened Bread that followed immediately after, the Lord said,
“And on the fifteenth day of this month is the feast; unleavened bread shall be eaten for seven days” (Numbers 28.17).
We noted this when we went through the Book of Exodus, noting the sevens that appear there, and the Lord repeated in the Book of Numbers that He wanted them to keep the Feast of Unleavened Bread for seven days, during which time Israel would remember their deliverance from Egyptian bondage, and that it happened quickly, so much so that they could not wait for bread to rise and bake it for the journey, but they had to bake their unleavened dough, and get out of Egypt quickly.
It would be several days before they could have regular bread again, and the Lord wanted them to remember the harsh conditions of the departure, that they might thank Him for what He had done on their behalf.
- The Bible In Our World (Part 7) (thebiblemeditator.wordpress.com)