Deuteronomy 16:5-9

NHEB(i) 5 You may not sacrifice the Passover within any of your gates, which the LORD your God gives you; 6 but at the place which the LORD your God shall choose, to cause his name to dwell in, there you shall sacrifice the Passover at evening, at the going down of the sun, at the season that you came forth out of Egypt. 7 You shall roast and eat it in the place which the LORD your God shall choose: and you shall turn in the morning, and go 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 number seven weeks.