This verse is from Medinan context where the Muslim community was struggling for legitimacy against the Jewish and Christian tribes, it attempts to hijack the authority of Jesus to validate Muhammad.
It contains the ONLY place in the Quran where Jesus is depicted predicting a future messenger by name. This is the primary battlefield for the "Paraclete" debate and the most direct evidence of the Quran’s failure to "confirm" the actual words of Christ.
Surah 61:6:
And when Jesus son of Mary said: O Children of Israel! Lo! I am the messenger of Allah unto you, confirming that which was (revealed) before me in the Torah, and bringing good tidings of a messenger who cometh after me, whose name is the Praised One (Ahmad). Yet when he hath come unto them with clear proofs, they say: This is mere magic.
Muslim apologists claim that the "Ahmad" mentioned here is the Parakletos (Comforter/Advocate) promised by Jesus in John 14, 15, and 16.
They argue the original Greek was Periklytos (Highly Praised), which matches "Ahmad."
There is not a single Greek manuscript, papyrus, or fragment in the history of the Church that uses the word Periklytos. Every single one uses Parakletos.
If the Quran is "confirming" a prophecy that doesn't exist in any manuscript, then the Quran is not a "Confirmer" (Musaddiq); it is a "Reviser" or an "Inventor."
In the Gospel of John, the Parakletos is explicitly identified:
Muhammad was a man, he died, and the world saw him.
TIf Muhammad is the one Jesus predicted in 61:6, then the Quran is contradicting the very Gospel it claims to be "confirming." If Jesus' words in the Gospel are true, Muhammad cannot be the "Ahmad"/Paraclete.
Jesus says he is "confirming what was before me in the Torah."
The heart of the Torah is the sacrificial system and the Priesthood.
The "Jesus" of the Quran abolishes the very things the Torah was established to maintain.
A "Confirmer" who removes the core of the document he is confirming is a logical contradiction.
Surah 61:6 says that Jesus told the Children of Israel the name of the next prophet would be 'Ahmad.'
We have the Gospel manuscripts from centuries before Muhammad and from the 7th century itself. The name 'Ahmad' (or any variation of it) is completely absent.
Islam claims the name was 'removed.' If the most important prophecy—the name of your Prophet—was successfully removed from every single Bible on earth without leaving a trace, then God failed to protect the 'Good Tidings' He sent through Jesus.
The Quran says Jesus came 'confirming' the Torah. If Jesus' words were changed to hide Muhammad, then the Bible was already 'unreliable' in the 7th century. Why would the Quran tell you to trust a book that had been so thoroughly scrubbed of its main point?
Either the name 'Ahmad' was never in the Gospel (making Surah 61:6 a false claim), or God allowed the Gospel to be perfectly corrupted (making the Quran’s claim to 'confirm' it impossible). If the name isn't there, the 'Confirmation' is a fabrication."
The specificity of the name "Ahmad," is a specific textual claim that the Muslim cannot prove.
The "Paraclete" in the Gospel is explicitly called the "Spirit of Truth" who "dwells within you," a description that cannot apply to a physical man like Muhammad.