The evangelist Luke

Was Luke a follower of Jesus, because he is not listed as one of the twelve apostles?

We have little information about Luke. You are correct in noting that he is not listed as one of the twelve apostles. Luke himself explains that he was not an eyewitness of Jesus’ ministry (Luke 1:2).

At some point, God brought Luke to saving faith in Jesus Christ. Luke accompanied the apostle Paul on his second and third missionary journeys. In 2 Timothy—likely the last epistle that Paul wrote—the apostle speaks of Luke being with him in Rome (2 Timothy 4:11).

While the information we have about Luke is scant, we are thankful for the Spirit-inspired content he has given us in the Bible books he wrote: Luke and Acts.