An Intertextual Commentary on Romans is an exhaustive treatment of the hundreds of Old Testament citations, allusions, and echoes embedded in Paul's most famous epistle. As many scholars have acknowledged, to understand Paul's engagement with Israel's Scriptures is to understand Romans. Despite this acknowledgment, there is a dearth of reference works in which the primary focus is how the Old Testament impacts Paul's argument from Romans 1:1 to 16:27. This four-volume commentary aims to provide just such a reference. The interplay between Romans and its vast sea of Old Testament pre-texts produces unstated points of resonance that illuminate Paul's rhetorical argument from the letter's opening to its closing doxology. Volume 1 examines the Old Testament pre-texts in Romans 1:1-4:25. Although the citations of Habakkuk 2:4 and Genesis 15:6 in this section of the letter often dominate intertextual discussions, several other Old Testament pre-texts, though often overlooked, support the intertextual subtext of the letter and thereby illuminate various features of Paul's argument. In this commentary, each of these pre-texts is examined from a variety of perspectives. Volume 2 examines the scriptural pre-texts in Romans 5:1--8:39. While this portion of Romans contains only one full citation, it is teeming with scriptural allusions and echoes that are critical to understanding Paul's argumentation. Crisler leaves no intertextual stone unturned as he probes the subtext of one of the richest sections in the entire Pauline corpus. From Paul's key transition in Romans 5:1 to his poetic flourish in 8:31-39, and everywhere in between, Crisler explores the interplay between the apostle's endless engagement with Israel's Scriptures and his message to the Christians in Rome. Volume 3 examines the scriptural pre-texts in Romans 9:1--11:36. This section of the letter is the most intertextually dense section of the New Testament and the most theologically controversial section in the entire Pauline corpus. If interpreters hope to navigate these exegetical and theological challenges, they must carefully analyze the intertextual subtext of these chapters where Paul engages Israel's Scriptures at every rhetorical turn. This volume provides such an analysis. The overarching aim of the commentary is to provide scholars, interpreters, and students with verse by verse analysis of how Israel's Scriptures impact almost every clause of Paul's most famous letter.