On page 238 of his NTL commentary on Hebrews Luke Timothy Johnson uses the word “interrupt” to describe the transition between exposition and exhortation starting in Hebrews 5:11. In a way I’m nitpicking here, and because I am, I must also note that overall I find Johnson’s commentary nearly the most useful I’ve read, and if I were just talking about theological reflection, I would call it the best.
I have a couple of objections to use of the word “interrupt,” however. First, it seems to me that calling the transition an interruption divides the text without consideration for the author’s purpose in writing. There is no exposition here which stands alone, and which can then optionally be applied to the hearers via an exhortation. Rather, the intention is exhortation and the exposition underlies the exhortation and is illustrated and illuminated by the nature of that exhortation.
Second, the exhortations also help raise questions for the further exposition that follows. In the case in question (Hebrews 5:11-6:12), the question of the faithfulness and reliability of God is raised, which will be answered in Hebrews 6:13ff. This is also the critical question of the entire book. God has provided the final High Priest (logically and temporally), who will offer the final sacrifice, and will provide the way back to the presence of God. Since this is all final, human beings are presented with this final choice, in the view of our author. If you reject this, what means can God provide for you?
Without exhortation, the exposition would be dry, pointless, and incomplete. The exhortation is an integral part of developing the topic.
I emphasize this because of some of my experience in studying Pauline epistles in college and graduate school. We would make it through the theological exposition in the beginning of the book, but when we got to the practical admonitions, those were treated as something of an afterthought by Paul. “Here’s your theology of salvation, and oh, by the way, there are a few things it would be a good idea to do …”
But for Paul those admonitions grow out of the theology he has presented. The practical elements are not appendices to letters that are otherwise theological treatises. It would be better to call the theological exposition introductory matter to the practical sections. Perhaps this explains why Galatians and Romans seem to get so much more treatment from a theological viewpoint than 1 & 2 Corinthians.
Sometimes I think the worst thing about biblical scholarship is that it is carried out by biblical scholars. Their interest is in extracting theological propositions and historical data. The writers, especially Paul, are writing pastorally. The two don’t always work well together.
At least that is the view from someone who took Romans (through chapter 8!) and Galatians (through chapter 4!) in school. As far as I could tell, the professors were happy with that.