Although focusing on the Old Testament meaning of Psalms is common, Ash asks readers to study this book with a Christ-focused approach. This comprehensive, four-volume commentary examines all 150 Psalms, exploring how they are quoted and echoed throughout the New Testament. Ash also includes thoughts from patristic, medieval, Reformation, and post-Reformation scholars for a full examination. 2480 pages total, hardcovers from Crossway.