In 2020, Walter R.L. Moberly, emeritus professor of the Old Testament at Durham University, published The God of the Old Testament: Encountering the Divine in Christian Scripture (Grand Rapids: Baker Academic, 2020), which is the follow-up of his Old Testament Theology: Reading the Hebrew Bible as Christian Scripture (Grand Rapids: Baker Academic, 2013) and The Bible in a Disenchanted Age: The Enduring Possibility of Christian Faith (Grand Rapids: Baker Academic, 2018). Characteristic of Moberly's approach to Old Testament theology is his profound philological and historical dealing with the texts, according to the academic requirements of the exegetical craft, and the clear theological focus of the questions he poses to these texts. He does not even shy away from attempting to set out a "grammar" of God as readers encounter him in Israel's scriptures as part of Christian Scripture. This paper analyses his methodology of reading the Old Testament as Scripture and presents it as an inspiring example of how the interaction between biblical exegesis and systematic theology can be fruitfully practiced. I intend to exemplify the usefulness of Moberly's method with some selected texts from the Book of Isaiah, which is the field of my research.