Deuteronomy 16:9

‘You shall also count for yourselves from the day after the sabbath, from the day when you brought in the sheaf of the wave offering; there shall be seven complete sabbaths.

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

So she stayed close by the young women of Boaz in order to glean until the end of the barley harvest and the wheat harvest. And she lived with her mother-in-law.

The Feast of Weeks