This continues the missionary journeys of Paul with Silas. Timothy is introduced into the story and joins Paul and Silas. Verses 1 and 2 give background information about Timothy. (See: [[rc://en/ta/man/translate/writing-background]])
The words "in Christ" are understood. Alternate translation: "who was a believer in Christ" or "who believed in Christ" (See: [[rc://en/ta/man/translate/figs-explicit]])