Many people think posing this question "Why did the students of Imam Abu Hanifa رضي الله عنه differ with him?" is a flaw in the Hanafi fiqh but this prooves that the madhab is not just based upon the opinions of an individual, but rather a shuraa. However in this short clip Maulana Ilyas Ghuman will answer this question from another ingenious angle.
The Taqleed of a scholar who is a Mujtahid in his school
A scholar who is a Mujtahid in his school follows and adopts an absolute Mujtahid's principles of extracting and deriving rules [usool] but possesses the ability to extract laws directly from the Quran and Sunnah. Such a Mujtahid may differ with his Imam on certain details and rules but follows the majority of the rulings with in the school. Imam Abu Yusuf and Imam Muhammed from the Hanafi school; Imam Muzni and Imam Abu Thaur from the Shaf'iee school; Imam Sahnoon and Imam Ibn Qasim from the Maliki school and Imam Ibrahim al-Harbi and Imam Abu Bakr al-Athram from the Hanbali school (may Allah have mercy on them) are all examples of Mujtahids within their respective schools who differed with the founders of their schools.
Shaykh Ibn Abi Deen رضي الله عنه introducing these scholars writes: "The second level [of Mujtahids] are those who are Mujtahids in their school of thought like Abu Yusuf and Muhammed and all other Hanafi scholars who are capable of deriving rules from the above mentioned proofs based on the principles of their teacher (Imam). These scholars, although differing with their teacher in certain details, follow him in the bases of his principles."
This is the reason why Imam Abu Yusuf and Imam Muhammed are considered to be Hanafi scholars even though they differed with Imam Abu Hanifa in many details. [Legal Status Of Following A Madhhab]
This cannot be undone and I am sure it will be greatly appreciated.
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