What do sahih, hasan and da'if mean?
Sahih, hasan and da'if are grades scholars give a hadith after examining who reported it. Sahih means judged authentic, hasan means judged reliable but a little less firm, and da'if means judged weak. A grade judges the report that reached us, not the Prophet ﷺ.
Why this matters in my religion
You see a saying of the Prophet ﷺ shared on a phone screen. Under it, someone has written "this hadith is weak". A second person replies that it is authentic.
If the words are the words of the Prophet ﷺ, how can anyone call them weak? That question causes real distress, and it rests on a misunderstanding worth clearing up.
The grade is never a judgment about the Prophet ﷺ. It is a judgment about the road the report traveled to reach us. That road is who carried it, whether they were honest, and whether their memory was reliable. Muslim scholars built an entire science to examine that road, because they refused to treat everything attributed to him as equal.
The idea, simply
Every hadith has two parts. There is the text — what was said or done. And there is the isnad, the chain of people who passed it along, name by name, back to the Prophet ﷺ.
Scholars examined the chain. For each narrator they asked three things. Was this person honest, and was their memory precise? Could they realistically have heard from the person they name? Biographical works were compiled for thousands of narrators to answer exactly that.
Then they looked at the text alongside stronger evidence, to see whether anything about it stood out as irregular.
The grade is the verdict on that examination.
| Grade | What the scholars judged | What it does not mean |
|---|---|---|
| Sahih | The chain is unbroken and every narrator is reliable and precise. Nothing irregular in the wording. | It does not mean every sahih hadith settles a ruling by itself. |
| Hasan | The chain holds, but one narrator's precision is rated a step lower. Still usable as evidence. | It does not mean doubtful or second-rate. |
| Da'if | Something in the chain is weak — a missing link, or a narrator judged unreliable. | It does not mean the Prophet ﷺ never said it. It means this route does not establish that he did. |
There is a fourth category, kept firmly apart from the three above. A report judged fabricated is not a weak hadith at all. It is a saying wrongly attributed, and scholars name it as such rather than grading it.
Three things follow that are worth carrying away.
Scholars sometimes differ on a grade. One may judge a narrator's memory acceptable and another may not. The same hadith can then be called hasan by one scholar and da'if by another. That is careful disagreement, not carelessness.
Da'if does not settle into one policy. Scholars differ on whether a weak report may be used at all, and if so where. Some restrict it entirely; others allow it in matters of encouragement while never building a ruling on it. This page reports the difference and does not choose between the positions.
A grade is not a ruling. Knowing a hadith is sahih tells you the report is sound. It does not tell you what it obliges, whom it applies to, or how it sits with other texts. That step is separate work.
From life
A message arrives in a family group. It carries a saying attributed to the Prophet ﷺ, with no collection named and no chain. It promises a specific reward for forwarding it.
Someone in the group asks where it comes from. Nobody knows. It was forwarded from another group, which received it from another.
That is the situation the whole science exists to address. The Qur'an already sets the instinct: “O ye who believe! If an evil-liver bring you tidings, verify it, lest ye smite some folk in ignorance and afterward repent of what ye did.” (Qur'an 49:6)
In plain terms: verify news before you act on it when the person bringing it cannot be trusted.
The useful response is not to argue about the content. It is to ask a plain question — who reported this, and where is it recorded?
What does this require of me?
Do not repeat a saying of the Prophet ﷺ without knowing where it comes from. This is the practical heart of the matter for a non-specialist.
Report a grade exactly as you found it. Never round da'if up to hasan because you like the text, and never round sahih down because you find it difficult. Say what the source said, and name the source.
Do not grade anything yourself. Assessing a chain requires knowledge of thousands of narrators. Reading that a hadith "sounds strong" is not an assessment.
Ask for the collection and the number when someone quotes a hadith at you as proof. A real reference can be checked. A screenshot cannot.
Do not build a decision on a single report you found alone. Even a sahih hadith needs a trained reader to apply it to your case.
Leave the difference alone. Where two qualified scholars grade a report differently, you are not the tiebreaker.
When do I need to ask a scholar?
Ask when a hadith is being used to tell you that something you do is forbidden. Also ask when it is used to say that something you avoid is obligatory. The step from a text to a ruling is exactly where training is required.
Ask when you find two scholars grading the same report differently and the difference affects an act you are about to perform.
Ask when you are unsure whether a widely shared saying is established at all. That is a short question with a checkable answer, and a qualified person can give it quickly.
In this library, a grading appears only where the source gave one, in the words the source used. Where a source states no grade, none is added.