The fivefold structure as ''Torah of David''
Doxology-bookended five-book edition. Midrash Tehillim reads the pattern as intentional parallel to the Pentateuch. Each book has distinct theological gravity: Book I's Davidic voice, Book III's covenant crisis, Book IV's YHWH-reigns response. Henry's commentary preface lays out the architecture; Spurgeon's Treasury of David preface engages the fivefold structure explicitly.