Don Carson looks at some difficult passages in Hebrews and does a wonderful job sifting through the challenges that these texts present to us.
The last message on Hebrews 5, the priesthood of Melchizedek, is particularly enlightening as it provides a framework for understanding the Levitical law as compared to the freedom from the law that was brought by Christ as the ultimate and final priesthood.
These three lectures were delivered for the J. B. Gay Lectures at Southern Baptist Theological Seminary in 2005.