“Al-Mustakhraj ‘ala Sahih al-Bukhari,” to which some compilers—among them al-Sakhawi—have referred, qualifying it with the remark “extracted on al-Bukhari only.” This Mustakhraj spans four volumes and one of its parts contains al-Bukhari’s annotations with an elevated chain of transmission. On p. 190 he writes: “As for the discussion of the nature and analysis of the Mustakhraj al-Isma‘ili, it will depend on the texts provided by Ibn Hajar (the editor notes that Ibn Hajar took 1,754 texts from the Mustakhraj al-Isma‘ili and recorded them in Fath al-Bari), in Fath al-Bari, which may shed light on certain aspects of its scholarly content and diversity.” In note (1) on the preceding page he adds: “because the original Mustakhraj is lost.” For further information on al-Isma‘ili and his work, in addition to the above, consult: • al-Dhahabi, Tadhkirat al-Huffaz, vol. 3, pp. 947–950 • al-Safadi, al-Wafi bil-Wafayat, vol. 6, p. 213 • Haji Khalifa, Kashf al-Zunun, vol. 2, p. 1735 • al-Zarkali, al-A‘lam, vol. 1, p. 83 • al-Kahhala, Mu‘jam al-Mu’allifin, vol. 1, p. 135 • Brockelmann, Geschichte der arabischen Litteratur, vol. 3, p. 210 • Sezgin, Geschichte des arabischen Schrifttums: ‘Ulum al-Qur’an wa al-Hadith, vol. 1/1, p. 408 • Akram Diya’ al-‘Umari, Buhuth fi Tarikh al-Sunnah al-Musharrafah, p. 254 (1) He is Abu Bakr Ahmad ibn Muhammad ibn Ahmad ibn Ghalib al-Khwarazmi al-Shafi‘i al-Barqani—named after the village of Barqan in Khwarazm—Shaykh of Baghdad, born 336 AH, died 425 AH. Among his works is al-Musnad, a manuscript comprising the material found in Sahih al-Bukhari and Sahih Muslim. See Brockelmann, Geschichte der arabischen Litteratur, vol. 3, p. 161; Sezgin, ‘Ulum al-Qur’an wa al-Hadith, vol. 1/1, p. 474; Diya’ al-‘Umari, Buhuth fi Tarikh al-Sunnah al-Musharrafah, p. 254. It appears that the “Sahih” mentioned by the Shaykh (may God have mercy on him) is al-Mustakhraj ‘ala al-Sahihayn, referenced by Ibn al-Salah in ‘Ulum al-Hadith, p. 17; by al-Dhahabi in Tadhkirat al-Huffaz, vol. 3, p. 1574; and by al-Kattani in al-Risalah al-Mustatrifah, p. 24. This work contains numerous additional readings in the redaction of the hadith texts. See also: al-Baghdadi, Tarikh Baghdad, vol. 4, pp. 373–376; Ibn ‘Imad, Shadharat al-Dhahab, vol. 3, p. 228; Haji Khalifa, Kashf al-Zunun, vol. 2, p. 1682; al-Zarkali, al-A‘lam.