Kammala jumla mai zuwa: "mawla" na kabilar Kindah, Abbad ya kasance mai gudanarwa ("wakil") na dukiyar Masar mallakar janar Harthamah ibn A'yan. Bayan fashewar da
a cikin yakin basasa na huɗu a 811 ya ƙarfafa mutanen Masar su watsar da amincinsu ga halifa al-Amin kuma su goyi bayan abokin hamayyarsa al-Ma'mun a maimakon haka, kuma lokacin da gwamnan al-Amin Jabir ibn al-Ash'ath al-Ta'i ya hambarar da shi ta hanyar juyin mulkin soja a farkon 812 ya ɗauki matsayinsa kuma a hukumance ya ba da rantsuwar biyayya ga al-Ma'mun. Ba da daɗewa ba ya sami kansa yana fuskantar adawa mai tsanani daga Qays na yankin Hawf, wanda al-Amin ya sa shugaba Rabi'ah ibn Qays ibn Zubayr al-Jurashi ya ɗauki makamai a madadinsa, kuma a cikin watanni masu zuwa sojojinsa sun sha wahala da yawa kuma an tilasta su kare Fustat daga maimaita hare-hare. Yaƙe-yaƙe ya ci gaba har sai bangarorin biyu sun sami labarin mutuwar al-Amin a watan Satumba na 813, kuma jim kaɗan bayan haka aka maye gurbin Abbad da al-Muttalib ibn Abdallah al-Khuza'i.