John Chrysostom

"For ye," he says, "became imitators of the Churches of God which are in Judaea." This is a great consolation. It is no wonder, he says, that they should do these things to you, inasmuch as they have done it also to their own countrymen. And this too is no little proof that the Preaching is true, that even Jews were able to endure all things. …

Homily on 1 Thessalonians 3 ↗

Theophylact of Ohrid

So that no one would understand by the churches in Judea the Jewish synagogues, he therefore added: "in Christ Jesus," to show more clearly that what is spoken of is the churches of believers. A great consolation! For if the Jews, zealots of the ancestral law, having once believed, endured so much, then how much more ought you? It is no small proof of the truth of the Gospel that the Jews willingly suffer for that which they themselves formerly persecuted.

Commentary on 1 Thessalonians ↗

Thomas Aquinas

Then when he says, for you, brethren, became imitators of the churches of God in Christ Jesus which are in Judea, he shows how courageously they persevered in the midst of tribulations; and in treating this he makes two points. First, he speaks of their trials, in which they stood firm; secondly, of the remedy he proposes to apply (2:17). Again, the first point is divided into two parts. First, Paul commends them for their patience in the face of difficulties; secondly, he reprehends those responsible for the difficulties (2:15). …

Commentary on 1 Thessalonians ↗