The Acts of the Apostles , usually referred to simply as Acts, is the fifth book of the New Testament; Acts outlines the history of the Apostolic Age. The author is traditionally identified as Luke the Evangelist.
The title "Acts of the Apostles" was not part of the original text. It was first used by Irenaeus late in the second century. Some have suggested that the title "Acts" be interpreted as "The Acts of the Holy Spirit" or even "The Acts of Jesus," since 1:1 gives the impression that these acts were set forth as an account of what Jesus continued to do and teach, Jesus himself being the principal actor.