And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel. – Hebrews 12:24

The text says not “the blood of sprinkling that spoke,” but “that speaks.” It is always speaking; it always remains a plea with God and a testimony to men. It never will be silenced, either one way or the other. In the intercession of our risen and ascended Lord His sacrifice ever speaks to the Most High. By the teaching of the Holy Spirit the atonement will always speak in edification to believers yet upon the earth. It is the blood that speaks. According to our text, this is the only speech which this dispensation yields us. Shall that speech ever be still? Shall we decline to hear it? Shall we refuse to echo it? God forbid. By day, by night, the great sacrifice continues to cry to the sons of men, “Turn from your sins, for they cost your Savior dearly. The time of your ignorance God winked at, but now commands all men everywhere to repent, since He is able to forgive and yet be just. Your offended God has Himself provided a sacrifice; come and be sprinkled with its blood and be reconciled once and for all.” The voice of this blood speaks wherever there is a guilty conscience, wherever there is an anxious heart, wherever there is a seeking sinner, wherever there is a believing mind. It speaks with a sweet, familiar, tender, inviting voice. There is no music like it to the sinner’s ear, it charms away his fears. It shall never cease its speaking so long as there is a sinner yet out of Christ, no, so long as there is one on earth who still needs its cleansing power because of fresh backslidings. Oh, hear its voice! Incline your ears and receive its blessed accents. It says, “Come now, and let us reason together, says the Lord; though your sins are as scarlet, they shall be as white as snow; though they are red like crimson, they shall be as wool.” ~ C.H. Spurgeon

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