entitled Mizān al-Iʿtidāl fī Naqd al-Rijāl (The Balance of Moderation in the Criticism of Transmitters). It gathers the biographies of narrators cited in Tadhīb al-Kamāl and the works that branched from it, together with entries for other transmitters as well. Among these he even lists reliable authorities, not to criticise them but to defend them, such as ʿAlī ibn al-Madīnī and ʿAbd al-Raḥmān ibn Abī Ḥātim.

Al-Ḥāfiẓ Ibn Ḥajar likewise compiled a substantial work that he entitled Lisān al-Mizān (The Tongue of the Balance). He based it on al-Dhahabī’s Mizān, adding a great number of new biographies, yet he restricted himself to transmitters who are not mentioned in Tadhīb al-Kamāl or its derivatives. Thus it effectively supplements the roster of narrators beyond those found in the Six Books.

Abū al-Saʿādāt Ibn al-Athīr brought together the texts of the Six Books—counting the Muwaṭṭaʾ as the sixth—in his Jāmiʿ al-Uṣūl, a work that has been printed and is widely circulated. Using this compilation, he produced an edited version of Razīn al-ʿAbdarī’s Tajrīd li-l-Ṣiḥāḥ wa-l-Sunan, and he marks each hadith