Blood is a strange and mysterious substance. The Bible doesn't tell us the chemical composition of the red or white corpuscles, but it does tell us that the life of every living creature is in the blood (Leviticus 17:11)
When God made man in His image, He breathed His own spiritual life into him. That life was held in the substance which we call blood. When man dies, life leaves the blood.
Before we can see how the blood of Jesus atones for sin, we need to understand some things that are unique about His blood. We are indebted to Dr. William Standish Reed of the Christian Medical Foundation of Tampa, Florida for enlightenment concerning the sinlessness of Jesus Christ, because of the fact that all of His blood was from God!
Luke 1:31 specifically states that the conception of Jesus took place in Mary's womb. Therefore, His was a supernatural conception. Normal human conception doesn't take place there. Rather, the uniting of the male sperm and the female ovum take place in the fallopian tube of the female. Neither the sperm nor the ovum have blood in and of themselves, only the ability to create blood of the new-life as it comes into being. Furthermore, the placenta which forms keeps the mother's blood from passing into that of the fetus.
Therefore, since Jesus' body was wonderfully fashioned in Mary's womb, He was sinless: none of the Adamic blood entered His being. Thus could Jesus, the only-begotten Son of God, declare, "I am the LIFE"
What does Scripture say concerning Jesus' Blood?

We are indebted to Dr. William Standish Reed of the
Christian Medical Foundation of Tampa, Florida