For the best commentary at reflecting the intention of the Assembly itself, you would want to pick one that comments on the 1646 WCF, and that rules out some of the modern commentaries. In this regard, I too would pick Dickson first; then Shaw second.

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Andrew Myers
Husband of Jessica, Father of Jackson, Katie and Samuel
Member, Presbyterian Reformed Church of Northern Virginia
Warrenton, VA USA
Editor, The Matthew Poole Project

"Let your Morning Thoughts, and your last Evening Thoughts, be what shall become of you to all Eternity." -- Matthew Poole