Imam Bukhari (Rahmatullah Alayh) is one of those Muhadditheen about whose book the entire Ummah collectively said, that this book is “اصح الکتب بعد کتب اللہ“, that means after the Book of Allah the most authentic book is ‘Sahih Bukhari’. But the Ummah did not claim this just like that, instead after controvert and regulative ‘Ulema explored and investigated every single Hadith and after pressing them through the countless sieves of controvert and criticism, this conclusion was the outcome and the entire Ummah agreed upon this. From 700.000 Ahadith Imam Bukhari (Rahmatullah Alayh) has selected these Ahadith, that are written in Sahih Bukhari. And he as well selected them in a way, that first off all bringing forward each of all the technical ways of auditing that exist he tested each Hadith and he reviewed it’s chain of narrators. And even after auditing and testing each Hadith and applying all the formulas, he wasn’t contented yet.
Before Writing of Hadith
But prior to each [session of] Hadith writing he took a bath, prayed two Raka’at and did Istikhara, and the reason for making Istikhara was to express to Allah Ta’ala,
“Ya’ Allah, to the limit of my effort and exertion and my knowledge I have researched this Hadith. And from this point this Hadith seems Sahih (sound) to me, but should I write it in the book or not? For this I am seeking Istikhara.”
Then after the heart has become satisfied and Allah Ta’ala opened his heart through doing Istikhara, he wrote the Hadith in the book.
[by Shaikhul Islam Hadhrat Mufti Muhammad Taqi Usmani (Hafizullah)]