Why does Les go back to the Day of Atonement in Leviticus 16?
The return to Leviticus 16 is made because the Day of Atonement beautifully pictures what John's Gospel and Hebrews reveal: Christ fulfilled every detail of that ritual. Though translators called it the Day of Atonement, it was actually a Day of Covering, since no atonement existed until Christ died.
Les teaches that he returns to Leviticus 16 for one primary reason: the Day of Atonement so beautifully pictures exactly what was seen from John's Gospel and from Hebrews—how Christ fulfilled in every detail this Day of Atonement. This follows the discussion of propitiation, where everything pictured in the tabernacle was fulfilled by Christ, our high priest, who presented His blood. Les also notes that it is unfortunate the translators called it the Day of Atonement, because it was not a Day of Atonement for Israel. There was no atonement until Christ died. It should have been called the Day of Covering.