Deuteronomy 16:6-8

6You must only offer the Passover sacrifice at the place the LORD your God will choose as a dwelling for His Name. Do this in the evening as the sun sets, at the same time you departed from Egypt. 7And you shall roast it and eat it in the place the LORD your God will choose, and in the morning you shall return to your tents.

8For six days you must eat unleavened bread, and on the seventh day you shall hold a solemn assembly to the LORD your God, and you must not do any work.