And there they preached the Gospel - Wherever they went, they were always employed in their Master's work. Some MSS. of considerable note add here, and all the people were moved at their preaching, but Paul and Barnabas tarried at Lystra.

And there they preached the Gospel. They did not sit still, nor hide themselves in these places; but, as in others, they preached the Gospel, the good news and glad tidings of the incarnation of Christ, of redemption, peace, and pardon, through his blood, justification by his righteousness, and spiritual and eternal salvation through him: in Beza's most ancient copy, and in one of Stephens's, these words are added, and which Bede also says were in the Greek copies in his time, "and the whole multitude were moved at their doctrines, and Paul and Barnabas continued at Lystra"; which agrees with what follows. It is very likely that many were converted in each of these cities, and in the adjacent country, and that churches were raised in these places; this seems manifest, from Acts 14:20 Artemas, of whom mention is made in Titus 3:12 and is said to be one of the seventy disciples, is reported to be bishop of Lystra; See Gill on Luke 10:1, though we meet with nothing in ecclesiastical history, concerning the churches in either of these places, until the "sixth" century; when in the fifth Roman synod under Symmachus, there were present the bishops of Lystra and Derbe, as also of Iconium and Larandas, which were likewise cities in Lycaonia (q).
(q) Magdeburg. Hist. Eccles. cent. 6. c. 2. p. 4.