Informed by the understanding that all texts are intertexts, this work develops and employs a method that utilizes the concept of intertextuality for the purpose of exploring the history of interpretation of a biblical text. With Day One, Genesis 1.1-5, as the primary text, the intertextuality of this biblical text is investigated in its Hebrew (Masoretic Text) and Greek (Septuagint) contexts. The study then broadens to take up the intertextuality of Day One in other Hebrew and Greek texts up to c. 200 CE, moving from Hebrew texts such as Ben Sira and the Dead Sea Scrolls to Greek texts such as Josephus, Philo, the New Testament, and early Christian texts. What emerges from this is a new glimpse of the intertextuality of Day One that provides insight into the complexity of the intertextuality of a biblical text and the role that language plays in intertextuality and interpretation. In addition to the methodological insights that this approach provides to the history of interpretation, the study also sheds light on textual and theological questions that relate to Day One, including the genesis of creatio ex nihilo.