And almost all things are by the law purged with blood; and without shedding of blood is no remission.
Hebrews 9:22
Leviticus 17:10-11 And whatsoever man there be of the house of Israel, or of the strangers that sojourn among you, that eateth any manner of blood; I will even set my face against that soul that eateth blood, and will cut him off from among his people. 11For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul.
Numbers 35:33 So ye shall not pollute the land wherein ye are: for blood it defileth the land: and the land cannot be cleansed of the blood that is shed therein, but by the blood of him that shed it.
I do not believe we are given a scientific explanation as to why it takes blood to cleanse us from sin, other than the life of the flesh is in the blood. It is the sins of the flesh we need to be cleansed from
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