Book of Commandments See also Book; Doctrine and Covenants; Scriptures Lord’s preface to book of his commandments, D&C 1:6. W. W. Phelps to publish Book of Commandments, D&C 67: Intro. the Lord testifies to truth of Book of Commandments, D&C 67:4. the Lord counsels to study Book of Commandments, D&C 67:6. Oliver Cowdery to take manuscript of Book of Commandments to Missouri, D&C 69: Intro. importance of Book of Commandments, D&C 70.