Averbeck argues that the "threefold division" of the law into moral, ceremonial, and civil laws "is neither legitimate nor helpful, from a biblical point of view". Instead, he argues that "the New Testament applies the whole law, including the so-called ceremonial parts to the church and the Christian life. It is not a matter of whether the Old Testament law applies but how the New Testament applies it." (Introduction) Averbeck argues for the following framework: First, the reader "needs to understand how the law worked in its original Old Testament context in the first place." Next, consider what was the "reality in the Old Testament itself" and how adjustments were made to the observance of the law even within the Old Testament itself, all the more so with the New Testament where, eg., the church is not a nation, the anticipated Messiah has come, and there is no longer separation between Jew and Gentile. In the New Testament, the Holy Spirit indwells believers and the Old Testament law is written on the hearts of believers – the New Testament thus develops the themes in the Old Testament law which informs "their application to us." (Conclusion)
Averbeck starts by establishing the covenants as the foundational context for discussing the Old Testament law, and how there is a "progressive historical development of the covenants" from Abrahamic to Mosaic to Davidic and eventually the new covenant. Each covenant builds on the other and "none of them eliminates the Lord's previous covenantal commitments and expectations". Rather, "they build together into a compilation of God’s ongoing covenantal commitments and his expectations for those who commit to him in those covenants." (ch 2) (cf. Galatians 3:15-17)
After two chapters of covenants, Averbeck spends five chapters examining the literary, historical, cultural, and theological context of the Old Testament law. He covers the decalogue (ch 4), judicial law in Exodus 21-23, Leviticus 17-27, and Deuteronomy 12-26 (ch 5), laws concerning the priesthood and tabernacle (ch 6), and laws concerning offerings and sacrifices, holiness, and purity (ch 7). While not a comprehensive treatise, these chapters form a good introduction and overview of one seeking to understand the Old Testament law on its own terms, before rushing to consider how it applies today; and/or without reading our modern assumptions into the law anachronistically.
The last four chapters cover Jesus's words concerning the law (ch 8), the way the New Testament church handled the law (ch 9), the goodness and weakness of the law (ch 10), and the unity of the law (ch 11). I found the last two chapters especially insightful – Averbeck argues for three essential points: the law is good, the law is weak, and the law is a unified whole. Scripture is explicit about the goodness (Romans 7:12) and usefulness (2 Tim 3:15-17) of the law, yet it is also clear that the law is weak (eg. Romans 8:3, Hebrews 7:18) – strength and power of the Christian life comes not from the law but through the "continuing practice of faith through the work of the Holy Spirit (Rom 8:4-16; Gal 3:1-7; 1 Cor 2:10-13) ... The Mosaic law was never designed to give anyone spiritual life [Gal 3:21]". But "the Holy Spirit uses [the law] as an indispensable guide for those who follow Jesus." (ch 10). The law is united in that there is no division of the law, it all applies to the life of the Christ. The question is how – Averbeck thus surveys a few areas.
On the laws concerning the priesthood, the Hebrews devotes a great deal of attention to the royal high priesthood of Jesus, while 1 Peter 2 applies the label of royal priesthood to the church (see also Revelation 1:6, 5:10, 20:6). Thus, we have "the priestly duty of proclaiming the gospel of God" (Romans 15:16), and we are exhorted to "continually offer to God a sacrifice of praise", and "to do good and to share with others, for with such sacrifices God is pleased" (Hebrews 13:15-16).
Concerning the law concerning the tabernacle and temple, "one can trace the theology of sacred space in the Old Testament into the New Testament in terms of the theology of sacred community" (Eph 2-3 and 1 Cor 3:16-17). Thus the theme of God's presence that permeates the Old Testament law concerning the Tabernacle and Temple bridge into the New Testament and further into the life of the church in this way.
On the law concerning sacrifices, Jesus calls His disciples to be sacrificial (Matt 10:38-39, Luke 9:23, Luke 14:26), and Paul entreats the church to "offer your bodies as a living sacrifice" (Rom 12:1). This, then, is how the sacrificial laws apply: "As with the Old Testament sacrifices, ours has to be holy and pleasing so that it is acceptable to him (see, e.g., Lev 1:3-4). In other words, we need to live our lives as a burnt offering, all of which goes on the altar to offer a “pleasing aroma” to him (Lev 1:9)."
Lastly, on the purity laws, 1 Peter 1:13-25 applies the Levitical commands to Christians by requiring them to "obe[y] the truth so that you have sincere love for each other" (1 Peter 1:22) "The purification terminology of the Old Testament applies to the New Testament believer too, but on the level of the presence of God in the life of the believer in the New Testament, in his or her heart and soul." Just as how God dwelt physically with His people in the Old Testament and now dwells with the church via the indwelling of the Holy Spirit, so too the Old Testament text was concerned with physical purification, while the concern for spiritual purification is brought to the fore in the New Testament (not that it was absent in the Old).
Final thoughts
I thought this was a good read, though I am a little surprised that Averbeck did not cover the civil and punitive laws in the Old Testament and their application in the New Testament (eg. 1 Cor 5:13), considering that it is an area of the law many struggle with. Perhaps he meant for this book to be more theological than exhaustive, and/or he has hit his publisher's limit. My nitpicking aside, I think Averbeck does a good job demonstrating the continuity of God's law from the Old Testament to the New, and situating the law in its proper place – not as evil or bad, but also not to do what only the Holy Spirit can do. I find his thesis compelling, and I think that he is right that Christians "should not be thinking in terms of the limits of the application of the Old Testament law in the life of the church and the believer but rather the real issue of how it applies—all of it!" (Conclusion)