His commitment to expositing the Word is evidenced by the fact that his entire sermon is based on a main biblical text. As many scholars have noted, the entire epistle may be considered as an exposition of Psalm 110, particularly Psalm 110:4; for example, this psalm is alluded to or explicitly referred to in nearly every chapter of this book. In addition to his exposition of Psalm 110, the author also exposits a major Old Testament text in each of the major subsections of his sermon (e.g. 1:4–2:8