TSK
Treasury of Scripture Knowledge references in NET.
For seven days you must eat bread made without yeast. Surely on the first day you must put away yeast from your houses because anyone who eats bread made with yeast from the first day to the seventh day will be cut off from Israel.
Then on the fifteenth day of the same month will be the Feast of Unleavened Bread to the LORD; seven days you must eat unleavened bread.
And on the fifteenth day of this month is the festival. For seven days bread made without yeast must be eaten.
Ezra read in the book of the law of God day by day, from the first day to the last. They observed the festival for seven days, and on the eighth day they held an assembly as was required.