Introduction
After discussing tahrif and the historical development of the corruption doctrine, a modern response often appears in Muslim-Christian dialogue:
“The Qur’an confirms the original Injil given to Jesus — not the four Gospels Christians have today.”
According to this view:
Jesus was given a single revealed book.
That original Injil was later lost or corrupted.
The four canonical Gospels are human writings, not the true Injil.
Therefore, when the Qur’an affirms the Injil, it refers to something different from the New Testament.
At first glance, this may seem like a clean solution.
But when we examine history, language, and the Qur’an itself, serious questions arise.
What Does the Qur’an Say About the Injil?
The Qur’an speaks of the Injil as a revelation given to Jesus.
For example, Surah 5:46 says:
وَآتَيْنَاهُ الْإِنجِيلَ فِيهِ هُدًى وَنُورٌ
“And We gave him the Gospel, in which was guidance and light.”
And Surah 5:47 says:
وَلْيَحْكُمْ أَهْلُ الْإِنجِيلِ بِمَا أَنزَلَ اللَّهُ فِيهِ
“Let the People of the Gospel judge by what Allah has revealed therein.”
Notice something important.
The Qur’an does not describe the Injil as lost.
It does not say:
“The original Gospel is gone.”
It does not say:
“The Gospel in your hands is no longer the true Injil.”
Instead, it commands Christians to judge by what Allah revealed in it.
The wording assumes possession.
The Historical Question
Now we must ask a historical question:
What Gospel did Christians possess in the 7th century?
By the time of Muhammad, Christians had been using the four canonical Gospels — Matthew, Mark, Luke, and John — for centuries.
These texts were:
Widely copied.
Publicly read in churches.
Translated into multiple languages.
Defended in theological debates long before Islam appeared.
There is no historical evidence of a separate, lost “Injil book” circulating independently of the four Gospels during that period.
If such a book existed, we would expect:
Manuscripts.
References from early Christian writers.
Evidence of communities using it.
But history does not show that.
An Early Islamic Source That Quotes the Gospel
It is also worth noting that early Islamic tradition itself sometimes treats the Gospel as something identifiable and quotable.
In the 8th century, the early Muslim biographer Ibn Ishaq (d. 767), whose work survives through Ibn Hisham’s recension, includes a passage that he says is taken:
“from what John the apostle set down for them when he wrote the Gospel…”
He then quotes a form of John 15:23–16:1, including the passage about the “Comforter” (Paraclete), and applies it to Muhammad.
Whether one agrees with Ibn Ishaq’s interpretation or not, something important is happening.
He does not speak of a missing book.
He does not say the Gospel is gone.
He refers to what “John set down” and treats it as accessible material that can be cited.
In other words, at least one early Islamic source interacts with a recognizable form of the Gospel and even associates it with John the apostle.
That does not solve every question about transmission or interpretation. But it does show that early Muslim writers did not uniformly treat the Injil as a completely lost document.
They treated it as something present enough to quote.
The Nature of the Four Gospels
Some Muslims argue that the four Gospels are biographies written by followers, not revelation given directly to Jesus.
But that does not solve the problem.
Because:
The Qur’an speaks of Christians possessing the Injil.
The only Gospel texts Christians possessed were the canonical Gospels.
The Qur’an commands them to judge by what Allah revealed in it.
If the Injil were something completely different and already lost, the Qur’an’s command becomes difficult to understand.
Why command people to judge by a book they no longer have?
A Logical Difficulty
The “lost original Injil” claim creates new problems.
If the original Injil was already lost or corrupted before Muhammad:
Why does the Qur’an speak as though Christians still possess it?
Why does it say they have the Gospel?
Why does it command judgment by what is revealed therein?
The simplest reading of the Qur’an suggests that it refers to the Scripture Christians actually possessed at the time.
And historically, that was the fourfold Gospel.
If that is the case, then the contradiction between the Qur’an and the New Testament cannot be avoided by appealing to a hypothetical lost book.
Why This Matters
The “original Injil” argument attempts to dissolve the dilemma by separating the Qur’an’s Injil from the New Testament.
But when we examine:
The Qur’an’s language,
The historical record,
The manuscript evidence,
Early Islamic engagement with the Gospel,
we do not find support for a separate, lost Gospel that Christians once had and then completely replaced.
Instead, we find the Qur’an speaking about Scripture Christians possessed in its own time.
That keeps the tension intact.
In the next article, we will shift from theological claims to historical evidence and ask:
If Allah revealed the Torah and Gospel, who protected them?
Did they survive in recognizable form before the rise of Islam?
That is where we turn next.