6For seven days you are to eat unleavened bread, and on the seventh day there shall be a feast to the LORD.
7Unleavened bread shall be eaten during those seven days. Nothing leavened may be found among you, nor shall leaven be found anywhere within your borders.
8And on that day you are to explain to your son, ‘This is because of what the LORD did for me when I came out of Egypt.’
— Exodus 13:6-8