Paul preached the gospel and Lydia became a believer.

Acts 16:13-15

13 On the first ◄Sabbath/Jewish day of rest► after we(exc) arrived, we went outside the city gate down to the river. We had heard someone say that Jewish people gathered to pray there. When we arrived there, we saw some women who had gathered to pray. So we sat down and began to tell them the message about Jesus. 14 A woman whose name was Lydia was one of those who were listening to Paul. She was a non-Jewish woman, from Thyatira city, who bought and sold expensive purple cloth. She had accepted what the Jews believe about God. The Lord God caused her to pay attention to the message that Paul preached, and she believed it. The members of her household also heard the good message and believed in Jesus [MTY]. 15 After Paul and Silas baptized Lydia and the others who lived in her house [MTY] {After Lydia and the others who lived in her house were baptized}, she invited us to go and stay in her home. She said, “You (pl) know that I now believe in the Lord Jesus, so please come and stay in my house.” She persuaded us to do that, so we(exc) stayed there.