Six days you shall eat unleavened bread, and on the seventh day there shall be a sacred assembly to the LORD your God. You shall do no work on it.
Deuteronomy 16:8
Surrounding context
16:7 And you shall roast and eat it in the place which the LORD your God chooses, and in the morning you shall turn and go to your tents.
16:8 Six days you shall eat unleavened bread, and on the seventh day there shall be a sacred assembly to the LORD your God. You shall do no work on it.
16:9 "You shall count seven weeks for yourself; begin to count the seven weeks from the time you begin to put the sickle to the grain.