Ephesus.

Acts 18:24
Meanwhile a Jew named Apollos, a native of Alexandria, came to Ephesus. He was an eloquent man, well versed in the Scriptures.

Acts 19:1, 17, 26
While Apollos was at Corinth, Paul passed through the interior and came to Ephesus. There he found some disciples . . .

Acts 20:16
Paul had decided to sail past Ephesus to avoid spending time in the province of Asia, because he was in a hurry to reach Jerusalem, if possible, by the day of Pentecost.

1 Corinthians 16:8
But I will stay in Ephesus until Pentecost,

Ephesians 1:1
Paul, an apostle of Christ Jesus by the will of God, To the saints in Ephesus, the faithful in Christ Jesus:

1 Timothy 1:3
As I urged you on my departure to Macedonia, you should stay on at Ephesus to instruct certain men not to teach false doctrines

2 Timothy 1:18
May the Lord grant Onesiphorus His mercy on that day. You know very well how much he ministered to me in Ephesus.

2 Timothy 4:12
Tychicus, however, I have sent to Ephesus.

Revelation 1:11
saying, "Write in a scroll what you see and send it to the seven churches: to Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia, and Laodicea."

Revelation 2:1
To the angel of the church in Ephesus write: These are the words of Him who holds the seven stars in His right hand and walks among the seven golden lampstands.

but.

Acts 18:4
Every Sabbath he reasoned in the synagogue, trying to persuade Jews and Greeks alike.

Acts 17:2, 3
As was his custom, Paul went into the synagogue, and on three Sabbaths he reasoned with them from the Scriptures, . . .