There are two different accounts regarding the details of Qasim's fate: According to Al-Baladhuri, a 9th-century historian, Qasim was killed due to a family feud with the governor of Iraq.
Terdapat dua catatan berbeda mengenai rincian nasib Qasim: Menurut Al-Baladhuri, seorang sejarawan Persia abad ke-9, Qasim dibunuh akibat perseteruan keluarga dengan gubernur Irak.