Is This Hadith Authentic?
Ask Theo. Get a verified answer from 668,436 primary sources — 61 hadith collections, 197,868 narrator assessments, and 14,917 chain defect analyses.
هَلْ هَذَا الْحَدِيثُ صَحِيحٌ؟
Free — 5 questions per day, no credit card
How Theo Verifies Every Hadith
Four simultaneous checks against the Islamic Primary Source Corpus™. Every time.
Search
Theo searches across 61 hadith collections for matching narrations — from Sahih al-Bukhari to Musannaf Ibn Abi Shayba.
Grade
Every hadith is graded: Sahih, Hasan, or Da'if with the grading scholar and source work cited.
Trace
Full narrator chain (isnad) analysis with individual narrator credibility assessments from 20 rijal works.
Verify
Cross-reference against 14,917 chain defect analyses from 8 specialist 'ilal works to detect hidden flaws.
What a Theo Verification Looks Like
Real output. Real sources. Every answer follows this format.
إِنَّمَا الأَعْمَالُ بِالنِّيَّاتِ، وَإِنَّمَا لِكُلِّ امْرِئٍ مَا نَوَى، فَمَنْ كَانَتْ هِجْرَتُهُ إِلَى دُنْيَا يُصِيبُهَا أَوْ إِلَى امْرَأَةٍ يَنْكِحُهَا فَهِجْرَتُهُ إِلَى مَا هَاجَرَ إِلَيْهِ
“Actions are judged by intentions, and everyone will be rewarded according to what they intended. So whoever emigrated for the sake of Allah and His Messenger, then his emigration is for Allah and His Messenger. And whoever emigrated for worldly gain or to marry a woman, then his emigration is for that which he emigrated.”
Narrated by ‘Umar ibn al-Khattab (رضي الله عنه)
Narrator Chain (Isnad)
All narrators assessed across 20 classical rijal works
Found In Collections
This is what every answer looks like in Theo
Verify Your Own HadithVerified Against the Islamic Primary Source Corpus™
The largest structured dataset of authenticated Islamic primary sources ever assembled for AI verification.
668,436
Primary source documents
Hadith texts, narrator biographies, grade records, and chain defect analyses — all indexed and cross-referenced.
61
Hadith collections
From the Kutub al-Sittah through Musnad Ahmad and 53 additional major and supplementary collections.
20
Rijal works
Classical narrator biographical dictionaries spanning 600 years of hadith scholarship.
8
'Ilal works
Specialist chain defect catalogs identifying hidden flaws invisible from surface grading.
Hadith Verification FAQ
Common questions about how Theo authenticates hadith.
How does Theo verify hadith authenticity?
Theo searches the Islamic Primary Source Corpus™ — 668,436 documents across 61 hadith collections — to find your narration. It identifies which collections contain the hadith, grades it with scholarly attribution, traces the full chain of narrators (isnad) with individual credibility assessments from 20 rijal works, and cross-references against 14,917 chain defect analyses from 8 specialist ‘ilal works. Every step is transparent and source-cited.
What hadith collections does Theo use?
Theo searches all 61 collections in the Islamic Primary Source Corpus™, organized across 13 tiers of scholarly authority. This includes the Kutub al-Sittah (Bukhari, Muslim, Abu Dawud, Tirmidhi, Nasa’i, Ibn Majah), Muwatta Malik, Musnad Ahmad, and 53 additional major and supplementary collections covering the full breadth of prophetic tradition.
Can Theo detect fabricated hadith?
Yes. Theo cross-references narrations against 4 dedicated fabrication detection works within the corpus. It identifies known fabricators in the narrator chain through rijal assessment and flags narrations cataloged as mawdu‘ (fabricated) by classical hadith scholars. The fabrication check is part of every verification.
Is the hadith verification free?
Yes. Every user gets 5 free hadith verifications per day with no credit card required. For unlimited verifications and advanced features like batch chain analysis, Theo Plus is available at $9/month.
What languages are supported?
Theo processes Arabic source texts natively using Arabic-only embeddings without translation, preserving the full semantic range of classical Arabic terms. The interface is available in both English and Arabic, and you can submit queries in either language.
How is Theo different from Sunnah.com?
Sunnah.com is a valuable hadith text repository. Theo goes further: it doesn’t just show the hadith text — it verifies authenticity, grades the narration with scholarly attribution, traces the full narrator chain with individual credibility assessments, and checks for hidden chain defects across 8 specialist works. Theo turns hadith lookup into hadith verification.
Every hadith deserves verification
Search 61 collections. Trace every narrator. Detect hidden chain defects. See the evidence behind every grade.
5 free verifications per day · No credit card required