Exodus 23:16
You shall keep the Feast of Harvest, of the firstfruits of your labor, of what you sow in the field. You shall keep the Feast of Ingathering at the end of the year, when you gather in from the field the fruit of your labor.

Exodus 34:22
You shall observe the Feast of Weeks, the firstfruits of wheat harvest, and the Feast of Ingathering at the year's end.

Leviticus 23:23
And the LORD spoke to Moses, saying,

Leviticus 23:24
"Speak to the people of Israel, saying, In the seventh month, on the first day of the month, you shall observe a day of solemn rest, a memorial proclaimed with blast of trumpets, a holy convocation.

Numbers 28:26
"On the day of the firstfruits, when you offer a grain offering of new grain to the LORD at your Feast of Weeks, you shall have a holy convocation. You shall not do any ordinary work,

Numbers 29:2
and you shall offer a burnt offering, for a pleasing aroma to the LORD: one bull from the herd, one ram, seven male lambs a year old without blemish;

Numbers 29:12
"On the fifteenth day of the seventh month you shall have a holy convocation. You shall not do any ordinary work, and you shall keep a feast to the LORD seven days.