How do we know that Aristarchus was a true companion of Paul?

Aristarchus is mentioned in the New Testament as not only a co-worker but also a fellow prisoner alongside the Apostle Paul. His inclusion in Paul's letters shows that he was deeply involved in the ministry and a source of encouragement to Paul during times of trial. Acts 19 and Acts 20 reference his companionship with Paul during critical moments, confirming his steadfastness in faith and commitment to the gospel. This support underscores the importance of genuine Christian fellowship and the way God uses individuals to strengthen one another in the faith.