Exodus 24: 3-8
Moses puts God’s commandments into writing and offers sacrifices.  With the blood of the sacrifice he seals the covenant on behalf of the people. 

Hebrews 9: 11-15
Christ is the high Priest of the new covenant, sacrificing not animals but his own body, and sealing the covenant with his own blood. 

Mark 14: 12-16.  22-26
During the feast of the Passover, Jesus blesses bread, gives it to his disciples and tells them to take and eat it as his body.  He then blesses wine and tells his disciples to drink it as his blood, the blood of the new covenant between the Lord and his people.