1 Corinthians 16:8

But I shall remain at Ephesus until the Pentecost;

Acts 2:1

And on the day of Pentecost they were all together in one place.

Acts 18:19

And they came to Ephesus, and he left them there; but he himself entered the synagogue, and reasoned with the Jews.

1 Corinthians 15:32

If with the views of men I fought with wild beasts at Ephesus, what advantage is it to me? If the dead rise not, "let us eat and drink, for tomorrow we die."

Treasury of Scripture Knowledge

Summary

But I will tarry at Ephesus until Pentecost.

Pentecost

Bible References

At

1 Corinthians 15:32
If with the views of men I fought with wild beasts at Ephesus, what advantage is it to me? If the dead rise not, "let us eat and drink, for tomorrow we die."

Pentecost

Acts 2:1
And on the day of Pentecost they were all together in one place.