2 Timothy 4:19-20

Greet Priscilla and Aquila and the household of Onesiphorus. Erastus stayed in Corinth, and I left Trophimus sick at Miletus. 

Great Priscilla and Aquila 
Acts 18:1-3  After this, Paul left Athens and went to Corinth. There he met a Jew named Aquila, a native of Pontus, who had recently come from Italy with his wife Priscilla, because Claudius had ordered all Jews to leave Rome. Paul went to see them, and because he was a tentmaker as they were, he stayed and worked with them.

and the household of Onesiphorus 
2 Timothy 1:16-18  May the Lord show mercy to the household of Onesiphorus, because he often refreshed me and was not ashamed of my chains. On the contrary, when he was in Rome, he searched hard for me until he found me. May the Lord grant that he will find mercy from the Lord on that day! You know very well in how many ways he helped me in Ephesus.

Erastus stayed in Corinth 
Acts 19:21-22  After all this had happened, Paul decided to go to Jerusalem, passing through Macedonia and Achaia. "After I have been there," he said, "I must visit Rome also." He sent two of his helpers, Timothy and Erastus, to Macedonia, while he stayed in the province of Asia a little longer.

and I left Trophimus 
Acts 20:4-5  He was accompanied by Sopater son of Pyrrhus from Berea, Aristarchus and Secundus from Thessalonica, Gaius from Derbe, Timothy also, and Tychicus and Trophimus from the province of Asia. These men went on ahead and waited for us at Troas.
Acts 21:29  (They had previously seen Trophimus the Ephesian in the city with Paul and assumed that Paul had brought him into the temple.)

sick in Miletus 
Acts 20:15  The next day we set sail from there [Assos] and arrived off Chios. The day after that we crossed over to Samos, and on the following day arrived at Miletus.
Acts 20:17  From Miletus, Paul sent to Ephesus for the elders of the church.

[brackets are mine]

Scriptures taken from the Holy Bible, New International Version® NIV®, 
Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
Limited to 15 verses per post.