The tent of the Lord is mentioned in the old testament part of the Bible and it signified the presence of God. The priest would go into the tent to offer up sacrifices for the sins of the people and for himself. In the new testament this tent has been replaced with our bodies, being the central place for God’s presence and dwelling of his spirit.
In Hebrews Chris is shown as the better high priest who has made atonement for our sins permanently with the shedding of his blood for us.
The blood of animals can only heal the sins of the people temporarily. But Christ has the power to heal us of our sins for ever. Giving us eternal life with the Father,