Islam cannot be practised from the Quran alone in the way the first Muslims practised it, because the Quran itself sends us to the Prophet (PBUH) as teacher, judge, and lived example. At the same time, hadith are not treated carelessly: they are weighed, sifted, and understood under the authority of the Quran.
The strongest Quran-only case
The argument deserves to be stated fairly. The Quran says it is guidance, light, and "an explanation of all things." So, the Quran-only advocate says: why make salvation depend on reports collected long after the Prophet (PBUH)? They add that some narrations mention an early prohibition on writing hadith, which suggests the Prophet (PBUH) wanted only the Quran preserved as binding scripture.
"And We have sent down to you the Book as clarification for all things, and as guidance and mercy and good news for the Muslims."
Quran 16:89
This concern is not silly. Muslims also agree that the Quran is the highest authority, and no hadith can override it. We also agree that forged reports existed, which is exactly why scholars developed strict methods of authentication.
What "the Quran alone" cannot actually produce
The problem is that the Quran does not present itself as a self-contained manual detached from the Messenger. It repeatedly commands believers to obey the Messenger, not merely to read the Book he recited. Obedience here is not symbolic. It includes his teaching, judgement, and practical explanation.
"Whoever obeys the Messenger has obeyed Allah."
Quran 4:80
"And We sent down to you the Reminder so that you may explain to people what was sent down to them."
Quran 16:44
"There has certainly been for you in the Messenger of Allah an excellent example."
Quran 33:21
Prayer is the clearest example. The Quran commands prayer constantly, but it does not lay out Fajr as two units, Maghrib as three, the wording of the tashahhud, the sequence of standing, bowing, prostrating, and sitting, or how zakat rates are applied in detail. If someone rejects the Sunnah, he does not end up with "pure Quranic Islam." He ends up choosing a practice through personal inference, inherited habit, or a modern teacher who is himself relying on some unacknowledged tradition.
Were hadith just late hearsay?
The famous hadith books were compiled after earlier generations, but that does not mean the material began then. Arabs preserved knowledge through memorisation, teaching circles, written notes, legal practice, and chains of transmission. The major compilers did not invent a tradition; they filtered a living one.
As for the report forbidding writing, it is real in meaning and found in Sahih Muslim: the Prophet (PBUH) forbade writing from him other than the Quran at one stage. Scholars explained this as an early precaution, so the Quran would not be confused with other speech. Other authentic reports show that writing was later permitted in specific cases, such as the Prophet (PBUH) ordering that a sermon be written for Abu Shah, and his permission to Abdullah ibn Amr to write.
So the evidence is not "the Prophet banned hadith." Rather, he protected the Quran's unique status while also teaching a Sunnah that his Companions memorised, practised, transmitted, and sometimes wrote.
What this proves - and what it does not
This does not prove that every narration in every book is automatically authentic, or that hadith can be used without scholarship. It proves something more basic: the Quran itself requires the Prophet's (PBUH) explanation, and the Muslim community is not free to replace that inherited explanation with private guesswork.
The sound position is balanced: the Quran is the foundation and final criterion; the authentic Sunnah is its prophetic explanation and lived form. Without the Sunnah, Islam becomes less certain, not more. It moves authority away from a scrutinised transmission tradition and hands it to the isolated reader.
So yes, read the Quran first and always return to it. But the Quran itself teaches us to learn Islam from the Messenger who received it, explained it, and showed his community how to live it.