The apostolic writings belonged to all the churches, or to the one Church of Christ. They were all circulated throughout the whole Church by being copied. No special directives were required for this. If the Apostle gives a special directive, it is in this sense: Do not wait until they decide to copy this Epistle for themselves. Send them the original quickly, so that they may read it quickly, because what was written to you is extremely necessary for them also. He does not mention the Hierapolitans, because they were outside the danger and could obtain a copy of the Epistle in the usual way.
And that which is written from Laodicea, see that you also read it. Without forcing the text, one cannot suppose that the Epistle of St. Paul to the Laodiceans is meant here. Rather, it is either the Epistle of the Laodiceans to St. Paul, or an Epistle of St. Paul from Laodicea, written by him to someone or somewhere. Theophylact supposes the latter, thinking that the First Epistle to Timothy is intended here. All our other interpreters hold the first opinion.
St. Chrysostom says, Some rightly maintain that here the meaning is not Paul's Epistle to the Laodiceans, but their Epistle to Paul. For he did not say, the letter written to the Laodiceans, but says, the letter written from Laodicea. Blessed Theodoret writes in the same sense: Some supposed that Paul also wrote to the Laodiceans, and therefore they present a spurious Epistle. But the divine Apostle said, not what was written to Laodicea, but what was written from Laodicea. For the Laodiceans wrote to the Apostle about something. Probably they were either accusing the Colossians because of what had occurred among them, or they were suffering from the same disease. Therefore the Apostle commanded that the Epistle be read to them also. Thus also Ambrosiaster, Oecumenius, and Photius in Oecumenius.
The Apostle writes indefinitely, την εκ Λαοδικειας: and that letter from Laodicea, see that you also read it. Speaking about the reading of his Epistle in the Laodicean church, he used the expression εν τη Λαοδικεων, that is, in the church, having the believers in mind. But here he says only την εκ Λαοδικειας, that which is from Laodicea, without indicating definite persons or a definite person. One may suppose that someone from Laodicea wrote anonymously to St. Paul, describing the calamity threatening the Laodicean and Colossian churches from false teachers. Epaphras, sent by the churches there to assist St. Paul, confirmed this. The Apostle writes the Epistle, directing it to the Colossians, but with the Laodiceans also in view. The letter written to St. Paul from Laodicea was handed by him to Tychicus, so that he might give it to the Colossians to read, as an explanation of why his own Epistle touched on this and that matter.