…and to Jesus the mediator of the new covenant, and to the blood of sprinkling… – Hebrews 12:24

Before a man entered upon the priesthood the blood was put upon his right ear, and on the big toe of his right foot, and on the thumb of his right hand, signifying that all his powers were thus consecrated to God. The ordination ceremony included the sprinkling of blood upon the altar round about. Even thus has the Lord Jesus redeemed us unto God by His death, and the sprinkling of His blood has made us kings and priests unto God forever. He is made of God unto us sanctification, and all else that is needed for the divine service. When the high priest went into the most holy place once a year, it was not without blood, which he sprinkled upon the ark of the covenant, and upon the mercy seat, which was on the top thereof. All approaches to God were made by blood. There was no hope of a man drawing near to God, even in symbol, apart from the sprinkling of the blood. And now today our only way to God is by the precious sacrifice of Christ, the only hope for the success of our prayers, the acceptance of our praises, or the reception of our holy works, is through the ever-abiding merit of the atoning sacrifice of our Lord Jesus Christ. The Holy Spirit bids us enter into the holiest by the blood of Jesus, there is no other way.

Have you not come a long way? Are you not admitted into the very center of the whole revelation? Not yet. A step further lands you where stands your Savior, the Mediator, with the new covenant. Now is your joy complete; but you have a further object to behold. What is in that innermost shrine? What is that which is hidden away in the holy of holies? What is that which is the most precious and costly thing of all, the last, the ultimatum, God’s grandest revelation? The precious blood of Christ, as of a lamb without blemish and without spot—the blood of sprinkling. ~ C.H. Spurgeon

https://www.blueletterbible.org/comm/spurgeon_charles/sermons/1888.cfm