Epaphras, my fellow prisoner in Christ Jesus, sends greetings to you, and so do Mark, Aristarchus, Demas, and Luke, my fellow workers. - Philemon 23-24
When Paul was an old man, Onesimus visited him while he was a prisoner for Christ Jesus. Luke sent his greetings to Philemon in the epistle Paul sent from prison, asking Philemon to free Onesimus from his slavery and debt.
(Philemon)