Contradiction with Exodus 24:8
This verse speaks of the covenant being established by the sprinkling of blood from sacrificed animals, contrasting the new covenant established through Jesus' blood as described in Luke 22:20.
Exodus 24:8: And Moses took the blood, and sprinkled [it] on the people, and said, Behold the blood of the covenant, which the LORD hath made with you concerning all these words.
Contradiction with Hebrews 9:22
This verse emphasizes the necessity of blood for forgiveness, potentially contradicting the idea in Luke 22:20 that Jesus' sacrifice was a once-and-for-all event for forgiveness.
Hebrews 9:22: And almost all things are by the law purged with blood; and without shedding of blood is no remission.
Contradiction with John 6:53-54
These verses describe the necessity of eating Jesus' flesh and drinking his blood to have eternal life, which may seem different in focus from the commemoration context of Luke 22:20.
John 6:53-54: Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.
Contradiction with Matthew 26:29
This verse implies Jesus will not drink of the vine again until a future event, which could be seen as contradicting the immediate establishment of the new covenant in Luke 22:20.
Matthew 26:29: But I say unto you, I will not drink henceforth of this fruit of the vine, until that day when I drink it new with you in my Father's kingdom.
Paradox #1
The potential conflict is that the wording about "new covenant in my blood" in Luke 22:20 might not be present in all ancient manuscripts, leading to debates about its originality. Some scholars suggest it was added later to align with similar verses in other Gospels.