Whakaotihia te rerenga e whai ake nei: I tohua ia i te Poutu-te-rangi 811 e te caliph al-Amin, hei whakakapi i a Hatim ibn Harthamah ibn A'yan. Heoi, i muri tata i muri i ia i akina ki te whawhai ki te pakarutanga o
pakanga a-iwi i waenga i a al-Amin me tona tuakana al-Ma'mun, a kaore i roa ka mau tonu tana pono ki a ia ki te tuatahi ka raru ia ki tetahi roopu o te "jund" a rohe i arahina e al-Sari ibn al-Hakam, i pai ki te mohio ki a al-Ma'mun hei caliph. I te puna o te tau 812 ka hurihia e te "jund", me te whakatenatena a al-Ma'mun, ka whakakeke, ka hinga a Jabir i tana tuunga. Ko tetahi kaitautoko o al-Ma'mun, ko Abbad ibn Muhammad ibn Hayyan, ka riro i a ia te kawanatanga ka riro i a ia te mana i Fustat, engari ko etahi atu waahanga o Ihipa i noho pono ki a al-Amin i raro i te kawana-kino a Rabi'ah ibn Qays ibn Zubayr al-Jurashi.