Deuteronomy 16:8 in the King James Version
Six days thou shalt eat unleavened bread: and on the seventh day shall be a solemn assembly to the LORD thy God: thou shalt do no work therein.
Context
7 You shall roast and eat it in the place which the LORD your God chooses. In the morning you shall return to your tents.
8 Six days you shall eat unleavened bread. On the seventh day shall be a solemn assembly to the LORD your God. You shall do no work.
9 You shall count for yourselves seven weeks. From the time you begin to put the sickle to the standing grain you shall begin to count seven weeks.