Deuteronomy 16:5-9

BSB(i) 5 You are not to sacrifice the Passover animal in any of the towns that the LORD your God is giving you. 6 You 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. 7 And 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. 8 For 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. 9 You are to count off seven weeks from the time you first put the sickle to the standing grain.