Deuteronomy 16:5-9
5 You must not sacrifice the Passover in any town the Lord your God gives you
6 except in the place he will choose as a dwelling for his Name. There you must sacrifice the Passover in the evening, when the sun goes down, on the anniversary of your departure from Egypt.
7 Roast it and eat it at the place the Lord your God will choose. Then in the morning return to your tents.
8 For six days eat unleavened bread and on the seventh day hold an assembly to the Lord your God and do no work.
9
Feast of Weeks
Count off seven weeks from the time you begin to put the sickle to the standing grain.