Thematic Bible: The whole system of mosaic rites

This is a symbol for the present time, during which gifts and sacrifices are offered that cannot perfect the worshiper's conscience. They are physical regulations and only deal with food, drink, and various washings imposed until the time of restoration.

That is why even the first covenant was inaugurated with blood. For when every commandment had been proclaimed by Moses to all the people according to the law, he took the blood of calves and goats, along with water, scarlet wool, and hyssop, and sprinkled the scroll itself and all the people, saying, This is the blood of the covenant that God has commanded for you. read more.
In the same way, he sprinkled the tabernacle and all the vessels of worship with blood. According to the law almost everything is purified with blood, and without the shedding of blood there is no forgiveness. Therefore it was necessary for the copies of the things in the heavens to be purified with these [sacrifices], but the heavenly things themselves [to be purified] with better sacrifices than these.