What many call "the Septuagint" today was a collection of varied Greek translations of the Hebrew Old Testament that circulated among Jews and Christians in antiquity. The apostles both read and referenced these Greek translations often, especially as they wrote to Greek-speaking churches throughout the Greek-speaking world. Sometimes, their use of the Septuagint comes across through translations of key words; other times, they quote directly from the Septuagint rather than the Hebrew. Their familiarity with the Greek Old Testament also exerts a behind-the-scenes influence on broader New Testament themes. Familiarity with the Septuagint, then, offers a fresh window into the study of the Scriptures, for pastors and engaged laypeople as well as for scholars.