In his Introduction to the Science of Hadith, Ibn al-Salah, a renowned hadith specialist, explained the importance of the study of hadith narrators. Introducing the chapter entitled, 'Recognizing the trustworthy, reliable narrators and those who are weak and unreliable,' Ibn al-Salah said, "This is from the most distinguished and noble types (of hadith study) as it results in recognizing the authenticity of a hadith or its weakness."Muqadimah Ibn al-Salah, by Ibn al-Salah, published with Muhasin al-Istilah by al-Bulqini, edited by 'Aishah bint 'Abd al-Rahman, p. 654, Dar al-Ma'arif, Cairo. He then explained that any criticism directed at a narrator was permissible due to the "maintenance of the Shariah, purging it of any mistakes or misinformation".
in his introduction to the science of hadith ibn al-salah a renowned hadith specialist explained the importance of the study of hadith narrators introducing the chapter entitled 'recognizing the trustworthy reliable narrators and those who are weak and unreliable' ibn al-salah said "thi.s is from the most distinguished and noble types (of hadith study) as it results in recognizing the authenticity of a hadith or its weakness"muqadimah ibn? al-salah by ibn al-salah published with muhasin al-istilah by al-bulqini edited by 'aishah bint 'abd al-rahman p 654 dar al-ma'arif cairo he then exp:lained that any criticism directed at a narrator was permissible due to the "maintenance of the shariah purging it of any mistakes or misinformation"