Chapters 8 through 10 in the book of Leviticus cover the consecration of Aaron and his sons. As you read, pay close attention to the words ordination, eat, clean, and unclean.

Once again, Moses is obedient to the Lord when it comes to the special offerings and sacrifices during the week of the dedication of the tabernacle. Blood represented the innocent life of the animal that was sacrificed in place of the guilty person. God granted forgiveness of the sinner based on the faith of the person doing the sacrifice - a foreshadowing of the sacrificial death of Jesus for our sins.  The Old Testament sacrifices only covered the sin temporarily.  Jesus' death on the cross removed even the guilt of sin.
Hebrews 9:11-14 
But when Christ had become a high priest of good things to come, by a greater and more perfect tabernacle, not made with hands, that is to say, not of this building   nor by the blood of goats and calves, but by His own blood He entered once for all into the Holies, having obtained eternal redemption for us.  For if the blood of bulls and of goats and the ashes of a heifer sprinkling the unclean sanctifies to the purifying of the flesh, how much more shall the blood of Christ (who through the eternal Spirit offered Himself without spot to God) purge your conscience from dead works to serve the living God?

This "pleasing aroma" of the sacrifice was a way of saying that God accepted the sacrifice because of the people's attitude.  This reminds us of the pleasing aroma of our prayers as they ascend before God.
Rev 8:4 
And the smoke of the incense which came with the prayers of the saints, ascended up before God from the angel's hand.

Aaron’s sons died because they offered unauthorized fire before the Lord. Do people today in positions of authority and leadership in effect offer “unauthorized fire” to the Lord? Do they do this in the form of unbiblical observances and teachings? Just a thought…

Jer 2:13
"My people have committed two sins: They have forsaken me, the spring of living water, and have dug their own cisterns, broken cisterns that cannot hold water.

Lev 10:10
You must distinguish between the holy and the common, between the unclean and the clean,
Again, something that church and denomination leaders are charged with, to teach the people the difference between the spiritual and the worldly.  When people are not taught the difference, the church will devolve into the apostate church and eventually will devolve into the false church during the last days.

How is it with us as believers in Jesus? Do we know the difference between the holy and the common, between the clean and the unclean? God tells us in Leviticus 10 "I will show himself holy; in the sight of all the people I will be honored."

Do we honor Him in the way we worship? Do we treat Him as holy? Is our attitude of worship pleasing to Him? Do we honor Him in the way we dress, the way we talk, the way we act?