Leviticus 23:16

You shall count fifty days to the day after the seventh Sabbath; then you shall present a new grain offering to the Lord.

Acts 2:1

When the day of Pentecost had come, they were all together in one place,

Numbers 28:26

‘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.

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