Numbers 28:26

26“ ‘On the day of firstfruits, when you present to the Lord an offering of new grain during the Festival of Weeks, hold a sacred assembly and do no regular work.

26‘Also on the day of the first fruits, when you present a new grain offering to the Lord in your Feast of Weeks, you shall have a holy assembly; you shall do no laborious work.

26‘Also on the day of the first fruits, when you present a new grain offering to the Lord in your Feast of Weeks, you shall have a holy convocation; you shall do no laborious work.

26‘Also on the day of the first fruits, when you offer a new grain offering to the Lord at your Feast of Weeks, you shall have a holy [summoned] assembly; you shall do no laborious work.

26On the day of firstfruits, when you present an offering of new grain to the Lord during the Feast of Weeks,28:26 That is, Shavuot, the late spring feast of pilgrimage to Jerusalem; it is also known as the Feast of Harvest(see Exodus 23:16) or the Feast of Pentecost(see Acts 2:1). you are to hold a sacred assembly; you must not do any regular work.

26“ ‘On the day you gather the first share of your crops, present to the Lord an offering of your first grain. Do it during the Feast of Weeks. Come together for a special service. Do not do any regular work.