“This is the blood of the testament which God hath enjoined unto you.”  -Hebrews 9:20

Blood is always a terrible thing. It makes a sensitive mind shudder even to pronounce the word; but, to look upon the thing itself causes a thrill of horror… What exquisite pain it must be caused our first parent how keenly it must have touched the fine sensibilities of their nature to have had to offer sacrifice! Probably they had never seen death until they brought their first victim to the altar of God. Blood! Ah! how they must have shuddered as they saw the warm life-fluid flowing forth from the innocent victim. It must have seemed to them to be a very horrible thing, and very properly so, for God intended them to feel outraged. He meant them to take to heart the anguish of the victim, and learn, with many a shudder, what a destructive and killing thing sin was… It was the great lesson which He meant to be taught to the Jewish people, that sin was a loathsome and a detestable thing, and that it could only be put away by the sacrifice of a great life, such a life as had not then been lived,-the life of the Coming One, the life of the eternal Son of God, who must Himself become man, that He might offer His own, immaculate life upon the altar of God to expiate the guilt, and put away the filth and the loathsomeness of human transgression.

Oh, I would that your sins would sicken you! I would to God that you had some sense of what a horrible thing it is to rebel against the Most High, to pervert the laws of right, to overthrow the rules of virtue, and to run into the ways of transgression and iniquity, for if blood be sickening to you, sin is infinitely more detestable to God; and if you find that being washed in blood seems awful to you, the great bath which was filled from Christ’s veins, in which men are washed and made clean, is a thing of greater and deeper solemnity to God than any tongue shall ever be able to express. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/3293.cfm