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.

Exodus 23:14
Three times a year you are to celebrate a feast to Me.

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

Leviticus 2:12
You may bring them to the LORD as an offering of firstfruits, but they are not to be offered on the altar as a pleasing aroma.

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 must not do any regular work.

Numbers 29:1
"On the first day of the seventh month, you are to hold a sacred assembly, and you must not do any regular work. This will be a day for you to sound the trumpets.

Deuteronomy 16:9
You are to count off seven weeks from the time you first put the sickle to the standing grain.

2 Chronicles 8:13
He observed the daily requirement for offerings according to the commandment of Moses for Sabbaths, New Moons, and the three annual appointed feasts--the Feast of Unleavened Bread, the Feast of Weeks, and the Feast of Tabernacles.

And you shall observe the feast of weeks, of the first fruits of wheat harvest, and the feast of ingathering at the year's end.