The Book of Luke
The early church fathers held Luke to be the author of both the Gospel of Luke and Acts: Irenaeus (about A.D. 130-200); Clement of Alexandria about A.D. 150-215; Origen about A.D. 185-254; and Tertullian about A.D. 160-200. A study of both books bears evidence that Luke is the author. The writer was evidently a physician. Greek medical terms are used. An analysis of the Gospel and Acts together shows the same style and language. There is also a clear understanding of the Roman and Greek world of the first century. The content of the two books shows a strong unity. There is a stress upon the resurrection, the Holy Spirit, the person of Christ, and the ministry to the Gentiles.Acts abruptly ends with Paul's two year imprisonment at Rome, so the writing would have been done some time after Jesus' ascension, just prior to the end of Acts. Another factor is that Luke says nothing about the Fall of Jerusalem. The fall of the city was prophesied by Jesus, and it actually took place in A.D.70.