Until now, God had dealt with the head of the household as His spokesman for the family. That period is known as the Patriarchal Age. The Mosaic Age began at this point in man’s history. God selected the first priesthood with Aaron as high priest and his sons as priests. No one outside the tribe of Levi could serve in this capacity.
The duties of the priests were numerous. Among those duties was the responsibility to intervene between God and the people. Aaron, as high priest also bore the sins of the people in that he made animal sacrifices for them. According to the writer of Hebrews, Christ is our High Priest today as He has borne our sins with the sacrifice of His life.
God demanded splendor, dignity and solemnity in His priesthood. He gave specific instructions for the types of materials to be used in the priestly garments. That made them easy to recognize as they mingled with the people. Those of the high priest were to be different and even more elaborate than those of the regular priests.