Fulfilling promises by OT prophets and Jesus himself, the exalted Lord pours out God’s Spirit on his witnesses, initiating cross-cultural witness and carrying on Jesus’s mission. Acts 1–2, which describes the first outpouring of the Spirit, is the introductory section that lays the groundwork for the rest of Acts. It is thus treated here in greater detail than space allows for subsequent chapters. Writers often introduced their main themes at the beginning of a work or section,1 including in narrative works.2