Language of the New Testament
From Textus Receptus
The New Testament was written in a form of Koine Greek, which was the common language of the Eastern Mediterranean from the conquests of Alexander the Great (335–323 BC) until the evolution of Byzantine Greek (c. 600).
The New Testament gospels and epistles were only part of a Hellenist Jewish culture in the Roman Empire, where Alexandria had a larger Jewish population than Jerusalem, and Greek was spoken by many Jews. Other Hellenistic Jewish writings include those of Jason of Cyrene, Josephus, Philo, Demetrius the chronographer, Eupolemus, Pseudo-Eupolemus, Artapanus of Alexandria, Cleodemus Malchus, Aristeas, Pseudo-Hecataeus, Thallus, and Justus of Tiberias, Pseudo-Philo, many Old Testament Pseudepigrapha and the so called Septuagint translation of the Hebrew Bible itself (most probably created in the early church era).