(1) It was published by Dar Tayba, Riyadh, 1982, edited and studied by Muhammad b. Mutahhar al-Zahrani under the title “al-Sabiq wa-l-Lahiq fi Taba‘ud ma Bayna Wafati Rawiyayn ‘an Shaykh Wahid” (The earlier and the later: on the chronological gap between the deaths of two transmitters who reported from the same shaykh). This is a valuable work; no one before al-Khatib had produced anything comparable in this field, nor has anyone who came after equalled him. The editor makes a mistake on the first page when identifying Abu l-Hasan ‘Ali b. ‘Umar, supposing him to be ‘Ali b. ‘Umar b. Muhammad b. al-Hasan, Abu l-Hasan al-Harbi, known as Ibn al-Qazwini (Tarikh Baghdad 12/43). The correct person is ‘Ali b. ‘Umar b. Muhammad b. al-Hasan b. Shadhan (Tarikh Baghdad 12/40), d. 386. From him al-Khatib cites the remark: “I shall certainly attach the juniors to the seniors—‘haddathana Ahmad b. al-Husayn b. ‘Abd al-Jabbar’—through ‘Ali b. Abi ‘Ali al-Basri.” Because of the initial confusion, the editor fell into a second error: he assumed that Abu l-Hasan’s words end at “to the seniors” and that the phrase “haddathana Ahmad b. al-Husayn b. ‘Abd al-Jabbar” belongs to al-Khatib, so he began it on a new line and commented, “I find no meaning for this sentence here,” even though Ahmad b. al-Husayn b. ‘Abd al-Jabbar is in fact the shaykh of ‘Ali b. ‘Umar. (2) Ibn al-Jawzi and Yaqut refer to it as “al-Mukammil fi Bayan al-Muhmal” (The supplement for identifying the unnamed). (3) In al-Anba’ al-Muhkama, as Yaqut reports, the author gathered 171 hadiths, alphabetically arranged, from narrators who were not named, and then disclosed their identities. A résumé of it exists by Imam al-Nawawi (d. 676) entitled “al-Isharat ila Bayan al-Asma’ al-Mubhamat,” likewise ordered alphabetically by the names of early hadith transmitters. See GAL, Suppl. 6, p. 62 (Arabic ed.). (4) He mentions it in his Tarikh, 11/429, as “al-Mawdih Awham al-Jam‘ wa-l-Tafriq” (The clarifier of the errors of combining and separating); it was printed in Hyderabad (India) in 1959–1960. (5) Full title: “al-Tathfil wa-Hikayat al-Tufayliyyin wa-Akhbaruhum wa-Nawadir Kalamihim wa-Ash‘arihim” (Invitations without being asked: stories, witticisms, and poems of the gate-crashers). Published by Husam al-Din, Damascus, 1346 AH; reprinted, edited by Kazim al-Mudhafar, at the Haydariyya Press, Najaf, 1966 CE. (6) In Tadhkirat al-Huffaz 1/1140 the title is mistakenly written “al-Funun.”