"But you are a chosen people, a royal priesthood, a holy nation, a people belonging to God, that you may declare the praises of him who called you out of darkness into his wonderful light." -1 Peter 2:9
In the Old Testament, it was unlawful for priests to do or wear certain things — it would make them unfit for priestly service. Priests could not touch the dead body of a relative outside of their immediate family, shave or trim their beards, or marry a prostitute or divorced woman. These rules were even more strict for a high priest, who could not do any of the above, but who also could not leave the sanctuary, tear his clothes, go near the dead body of ANY person, or marry even a widow. (Leviticus 21) The reason for this was that they needed to be sanctified (set apart) for their duties to interceed for the people and offer sacrifices to God in the temple. This was serious work!
Today, this Old Testament covenant no longer applies because of the power of Jesus' precious blood atoning for our sin. He is our High Priest, and we are the royal priesthood. However, this does not mean we do not need to also set ourselves apart in sanctification for our own calling.
This sanctification may mean "not touching dead things" — that is, not bringing up old things from the past that we have already forgiven. Or, letting go of old, "dead" mindsets or behaviors that keep us stuck and in bondage. It may mean letting go of things that continue to bother us, that bring death to us; it may mean catching ourselves to stop speaking "death" over our lives, situations, or other people around us. "The tongue has the power of life and death, and those who love it will eat its fruit." -Proverbs 18:21
Are there any dead things in your life that you to stop touching? Pray for God's grace and power to let go of anything dead in your life.