Lists of prominent companions usually run to 50 or 60 names, the people most closely associated with Muhammad. However, there were clearly many others who had some contact with Muhammad and their names and biographies were recorded in religious reference texts such as ibn Sa'd's early Book of the Major Classes. Al-Qurtubi's Istīʻāb fī maʻrifat al-Aṣhāb, who died in 1071, consists of 2770 biographies of male and 381 biographies of female ṣaḥābah.