Jesus fulfilled the Whole Law. Not just the Ten Commandments, but 613 commandments and 213 health laws. Our sins have been forgiven. 2. Atoning Blood. The book of the Covenant.
Every promise is endorsed in blood.
The priest and the ram of consecration. In the beginning was the Word, and the Word was with God, and the Word was God. The Father and His Son are the light of the Holy City, the New Jerusalem. Therefore they were under the blood. That is how the expression came into existence.