Exodus 13:7 in the King James Version
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.
Context
6 Seven days you shall eat unleavened bread, and in the seventh day shall be a feast to the LORD.
7 Unleavened bread shall be eaten throughout the seven days; and no leavened bread shall be seen with you. No yeast shall be seen with you, within all your borders.
8 You shall tell your son in that day, saying, ‘It is because of that which the LORD did for me when I came out of Egypt.’