In Mark 14, 24, Jesus said to them, This is the blood of the new covenant, which is shed for many. Jesus is establishing the Lord's Supper in which we remember the shedding of Jesus' blood and His dying on the cross for our sins. And we also look forward to His second coming. This is not an act which can do anything to save us or contribute to it, but the drinking of the cup is a picture of the shedding of His blood. Jesus is putting the new covenant in place in which those who trust in the shed blood of Christ by His dying on the cross, being buried, and rising the third day will become a child of the King. That's 1 Corinthians chapter 15, verse 3 and 4. We who have believed in Him for salvation should celebrate this fact of all that He did for us to forgive our sins and remember that He is coming again. Those who have not trusted in Him should trust Him now. John 3, 16, for God so loved the world that He gave His only begotten Son that whoever believes in Him should not perish but have everlasting life.