Sheikh al uthaymeen over de voorwaardes voor een mujtahied
1 That he knows the Sharee’ah proofs which he needs in his ijtihaad - such as the aayaat (verses) and ahaadeeth pertaining to rulings.
2 That he knows what relates to the authenticity or weakness of a hadeeth, such as having knowledge of the isnaad (chain of narration) and it’s narrators, and other than this.
3 That he knows an-naasikh (the abrogating) and al-mansookh (the abrogated), and the places where there is ijmaa’ (consensus) - such that he does not give a ruling according to something that has been abrogated, nor give a ruling that opposes the (authentically related) ijmaa’.
4 That he knows from the proofs that which causes the rulings to vary, such as takhsees (particularisation), or taqyeed (restriction), or it’s like. So he does not give a judgement which is contrary to this.
5 That he knows the Arabic language and usoolul-fiqh (fundamentals and principles of jurisprudence), and what relates to the meanings and indications of particular wordings - such as al-’aam (the general), al-khaass (the particular), al-mutlaq (the absolute and unrestricted), al-muqayyid (the restricted), al-mujmal (the unclarified), and al-mubayyin (the clarified), and it’s like - in order that he gives rulings in accordance with what this demands.
6 That he has the ability to extract rulings from the evidences.
Bron:
http://www.troid.org/articles/ibaadah/knowledge/taqleedandmadhaahib/ijtihaadandtaqleed.htm