This speaks clearly of the three aspects of sin that is so prevalent in all of us if we are not careful.
1. The hide speaks of The Winsomeness of Sin.
The hide is, of course, the skin. When people say that a person is attractive to them, they often make reference to the outside form, i.e. the skin. So it is with sin - it is attractive to the senses and draws us to it. We think of Eve, in the garden of Eden, how she saw that the forbidden fruit was "pleasant to the eyes" (Genesis 3 v 6). Sin has an attraction BUT, there is a payback, both in this life and for eternity.
2. The flesh speaks of The Willfulness of Sin.
The flesh speaks of that which is wilful. While it is possible for a person to sin in ignorance, for the most part people commit sin deliberately. They do what they know to be wrong, and oppose the Bible as it teaches them wherein they have erred (hence one reason why Christians are persecuted). In Eccles. 7 v 29 we read that God made man upright, "but they have sought out many inventions".
3. The dung speaks of the Wastefulness of Sin.
People seem so concerned about not wasting their lives and wanting to achieve so much (a so-called "bucket list") but what about their souls? In Mark 8 v 36-37 we read of the Saviour teaching that the value of a soul is worth more than all the wealth of the world. Conversely, people who live without Christ have wasted their lives and their souls.
So much for the 3 Ws of sin, but what is the remedy? In this verse (Lev 8 v 17) we read of how the various items (hide, flesh and dung) were burned "outside the camp". What does that remind us of?
Turn to Hebrews 13 v 10-12 and we read that the burning of animals outside the camp is a picture of Christ and how he suffered "outside the gate" in order to be a sacrifice for our sins.
When reading through the Old Testament we are apt to think that so much of it is not relevant to us - but it is! Particularly is this so when we read these wonderful pictures of Christ and His work for us on the cross.
May the Lord be pleased to open our eyes to find these pictures and appreciate the Saviour more.