This first volume covers the first twelve chapters of the Gospel of Matthew. This doesn't read like a commentary, per se, as it is quite engaging and full of astute observations from the text. Leithart's objective is to show "that Matthew organized his account of the life of Jesus as an Irenaean recapitulation of Israel’s history, in which Jesus replays both major individual roles of that history (Moses, David, Solomon, Elisha, Jeremiah) as well as the role of the nation herself."
He begins with a brief overview of the book, showing how Jesus recapitulates Israel personally, and nationally. Then he dives into the text and gives an overview of the section. This is not a methodical, exegetical commentary, though, instead, it is a biblical-theological examination of how Jesus lives out Israel.
Leithart connects Matthew with Old Testament texts and understands the Old Testament well enough to make connections that those well-read in the Old Testament themselves will intuitively see and understand.
This book is invaluable in helping readers make connections and understand the text like Matthew's first readers would have, having an intimate knowledge of the Old Testament.
I expect I'll be referring to this for a long time to come. I only wish the second volume were available, as I'm eager to continue the study. I highly recommend this work!