For that old system deals only with food and drink and ritual washing -- external regulations that are in effect only until their limitations can be corrected.
So Christ has now become the High Priest over all the good things that have come. He has entered that great, perfect sanctuary in heaven, not made by human hands and not part of this created world.
Once for all time he took blood into that Most Holy Place, but not the blood of goats and calves. He took his own blood, and with it he secured our salvation forever.
Under the old system, the blood of goats and bulls and the ashes of a young cow could cleanse people's bodies from ritual defilement.
Just think how much more the blood of Christ will purify our hearts from deeds that lead to death so that we can worship the living God. For by the power of the eternal Spirit, Christ offered himself to God as a perfect sacrifice for our sins.
That is why he is the one who mediates the new covenant between God and people, so that all who are invited can receive the eternal inheritance God has promised them. For Christ died to set them free from the penalty of the sins they had committed under that first covenant.
Now when someone dies and leaves a will, no one gets anything until it is proved that the person who wrote the will is dead.
References for Hebrews 9:16
The will goes into effect only after the death of the person who wrote it. While the person is still alive, no one can use the will to get any of the things promised to them.
That is why blood was required under the first covenant as a proof of death.
For after Moses had given the people all of God's laws, he took the blood of calves and goats, along with water, and sprinkled both the book of God's laws and all the people, using branches of hyssop bushes and scarlet wool.
Then he said, "This blood confirms the covenant God has made with you."
References for Hebrews 9:20