Exodus 23:16
You are also to observe the Feast of Harvest with the firstfruits of the produce from what you sow in the field. And observe the Feast of Ingathering at the end of the year, when you gather your produce from the field.

Exodus 34:22
And you are to celebrate the Feast of Weeks with the firstfruits of the wheat harvest, and the Feast of Ingathering at the turn of the year.

Leviticus 23:23
The LORD also said to Moses,

Leviticus 23:24
"Speak to the Israelites and say, 'On the first day of the seventh month you are to have a day of rest, a sacred assembly announced by trumpet blasts.

Numbers 28:26
On the day of firstfruits, when you present an offering of new grain to the LORD during the Feast of Weeks, you are to hold a sacred assembly; you are not to do any regular work.

Numbers 29:2
As a pleasing aroma to the LORD, you are to present a burnt offering of one young bull, one ram, and seven male lambs a year old, all unblemished,

Numbers 29:12
On the fifteenth day of the seventh month, you are to hold a sacred assembly; you must not do any regular work, and you shall observe a feast for the LORD for seven days.