Chapter 15 ensured that the Israelites would separate sexual intimacy from worship, unlike the pagan religions around them.
Chapter 16 discusses the Day of Atonement. So many things we can learn from this chapter! The book of Hebrews discusses how Jesus is superior. Jesus is superior to Aaron. He is a better high priest. He is a better mediator. He is the perfect sacrifice.
The Day of Atonement did a few things - it cleansed the temple itself so that God's presence could continue to dwell with the Israelites, and it temporarily covered the sins of the Israelites. Both of these things were only done perfectly in Jesus Christ.
Even with the Day of Atonement, only the High Priest had access to God's presence and even that was veiled by a cloud of incense and limited to one day a year after following explicit instructions. With the perfect sacrifice of Jesus, the veil was torn and all believers now have complete and full access to God - which we will only experience in true perfection in heaven.
Our Hebrews 11 chapter (one of my favourites!) discusses the faith of the OT saints. Considering their limited revelation their faith is astounding and incredibly courageous.
The courage of faith isn't always to conquer the seemingly impossible, but to continue in suffering. "they refused to be released" implies that the torture could have stopped if they had recanted. But they didn't. They would rather suffer torture to the point of death than deny their God. And what gave them encourage was focussing on eternity instead of this present and short life.
Just like Shadrach, Meshach, and Abednego, they knew that God COULD save them, but they didn't know whether or not He WOULD. But it didn't matter to them, they would not reject their God no matter what happened. He is always glorified in that type of faith.
Tomorrow's Bible In a Year Passage passage: Leviticus 17-18; Hebrews 12