Jafar ibn Muhammad ( Larabci : جعفر بن محمد) (702-765), ma da aka sani da As-Sadiq (Gaskiya) shine na shida a Shi'a imam . Shi jika ne ga Zayn al-Abidin kuma zuriyar Ali bin Abi Talib ne a gefen mahaifinsa da kuma Abubakar a gefen mahaifiyarsa. Ana girmama shi sosai tsakanin Ahlussunna da Shi'a . Mutum ne mai son addini, mai ba da labarin hadisi kuma masanin shari'a . Bayan mutuwar Jafar bn Muhammad, rarrabuwa ta faru a tsakanin ‘yan Shi’a kan batun Imami na gaba. Wasu sun ce babban dansa, Ismail ibn Jaffar (wanda ya mutu kafin mahaifinsa) ya zama limami na gaba, yayin da mafiya yawan ‘yan Shi’ar suka ce dansa na uku Musa al Qazim ya zama limami na gaba. Rukuni na farko ya zama sananne da Isma'ilawa kuma na biyun, mafi girma rukuni mai suna Jafari ko 'yan sha biyu . Gleaves, Robert. "JAʿFAR AL-ṢĀDEQ i. Life". Encyclopedia Iranica. Retrieved 2015. Check date values in: |access-date= (help) According to Gleaves, most sources give 702 as the year of his birth, but there are some which give 699 and others which give 705.