Most modern sources claim that Bukhari memorized and evaluated some 600,000 hadith, of which he selected only the ones he designated authentic in his Sahih compilation. Yet, according to a Hadith attributed to Bukhari himself, this number was much larger.
In the book “An Introduction to Sahih Bukhari, Authors Biography, Recensions, and Manuscripts,” by Mustafa Al-Azami it cites a quote from Tarikh Bukhara (History of Bukhara), where ibn Ahmad ibn Ahmad Ghunjar said:
“I heard Abu ‘Amr Ahmad ibn Muhammad al-Muqri’: I heard Mahib ibn Sulaym: I heard Ja’far ibn Muhammad ibn al-Qattan, the Imam of Karminyah: I heard Muhammad ibn Isma’il [Bukhari] say, “I wrote from over a thousand teachers, and from each teacher over ten thousand hadiths. I remember the chain for every hadith that I know.”
If Bukhari studied under a thousand teachers, and from each over ten thousand hadith would mean that Bukhari wrote and memorized over 10 million Hadith.
If we are to take Bukhari’s quote seriously, we can calculate how long such an accomplishment would take in the most optimistic scenario. If we generously assume that Bukhari could write one Hadith and memorize its isnad in a minute.
This would imply that if Bukhari did nothing other than write and memorize Hadith, meaning that he did not eat, sleep, or do anything else, such a feat would take over 19 years to achieve. The absurdity of such a claim is obvious; note the reason that later generations reduced this number to 600,000 to make it seem more believable.
On the same page, it also states that,
“During my stay in Nishapur, I would receive letters from my relatives in Bukhara conveying their greetings. I would intend to respond to their greetings, but their names would escape me, so I never replied – however, rarely did I forget knowledge.
So the same person who claimed to write and memorize the isnad of over 10 million Hadith was incapable of remembering the names of his own family members 😦
Quran Talk Blog 
Salaamun Alaykum, Allah says several times in the Qur’an do not follow any Hadith, except the Qur’an. Bukhari is a liar and disbeliever in the Message of the Qur’an, he has mislead many people into following the divinely forbidden writings inspired by Shaytan called hadith! The only Hadith to follow is the Qur’an alone!
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