Albert Barnes on Romans 16:3

Greet Priscilla and Aquila. Salute; implying the apostle's kind remembrance of them, and his wishes for their welfare.

Priscilla. Priscilla was the wife of Aquila. They are mentioned in Acts 18:2,26, 1Cor 16:19. Paul at first found them at Corinth. Aquila was a Jew, born in Pontus, who had resided at Rome, and who had left Rome, and come to Corinth, when Claudius expelled the Jews from Rome. Acts 18:2. It is probable that they were converted under the preaching of Paul. Paul lived with them, and they had the advantage of his private instruction, Acts 18:3; comp. Rom 16:26. At the death of Claudius, or whenever the decree for the expulsion of the Jews was repealed, it is probable that they returned to Rome.

My helpers. My fellow-workers. They had aided him in his work. A particular instance is mentioned in Acts 18:26. They are mentioned as having been with Paul when he wrote the first epistle to the Corinthians, 1Cor 16:19.

In Christ Jesus. In the Christian cause.

(r) "Priscilla and Aquila" Acts 18:2