Acts 2:1 -
And when the day of Pentecost was fully come, they were all with one accord in one place.
Acts 20:16 -
For Paul had determined to sail by Ephesus, because he would not spend the time in Asia: for he hasted, if it were possible for him, to be at Jerusalem the day of Pentecost.
1 Corinthians 16:8
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But I will tarry at Ephesus until Pentecost.