Chapter 10 of Hebrews begins with explaining that the Old Covenant (law) which required the sacrifice of animals to cover sins, it was imperfect because we messed up. But under the New Covenant, through Jesus’ perfect sacrifice of Himself, we can now enter into Heaven and relationship with God more fully.
But it also includes stern warning! We’re not to spurn the blood of Jesus – by carrying on in sin – for His is the last sacrifice.
The good news is, when we focus on Jesus, we can have confidence to stand in the Holy Place – because of His blood.