John Chrysostom

"Timotheus my work-fellow saluteth you." Observe the customary encomiums again. "And Lucius, and Jason, and Sosipater my kinsmen." This Jason Luke also mentions, and sets before us his manliness also, when he says, that "they drew" him "to the rulers of the city, crying," etc. And it is likely that the others too were men of note. For he does not mention relations barely, unless they were also like him in religiousness.

Homily on Romans 32 ↗

Theophylact of Ohrid

Timothy labored with him in the gospel; and to do the same thing that Paul did is great praise. This Jason is mentioned in the Acts of the Apostles as one who endured dangers most courageously (Acts 17:6). And they are kinsmen of the apostle not only according to the flesh, but also, what is far more important, according to piety; for if they had not been such, he would not have mentioned them.

Commentary on Romans ↗

Thomas Aquinas

Then when he says, Timothy, he greets them on the part of others, saying: Timothy, my helper, greets you: I have sent you Timothy, who is my dearest and faithful son in the preaching of the Gospel (1 Cor 4:17). He adds: so do Lucius and Jason and Sosipater, my kinsmen, who were Jews.

Commentary on Romans ↗