In other words, it is clear that describing the Imams as being just is not meant to inform us of the Imams bearing such a characteristic; because in the existence of infallibility, such a concept has no sense. Therefore, the above description is meant to tell that the Imams' successorship is intended to establish justice in its broad sense, and that the establishment of justice in that sense is possible only by this group of people. There are many traditions about the reappearance of Imam Mahdi (may Allah hasten his reappearance) and these traditions are considered to be mutawatir and they can be useful for our discussion.
Mas;ala 92: Ni wajibu katika hali ya kuosha kwa maji kuondoa najisi yenyewe na athari zake kwa maana kuwa kuondoa chembe chembe ndogo ambazo hazionekani na kwa kawaida haziondoki isipokuwa kwa kutumia maji, na si wajibu kuondoa rangi na harufu, na inatosha katika upangusaji kuondoa najisi yenyewe, na si wajibu kuondoa athari za najisi, na ikiwa haja kubwa itatoka ikiwa na najisi nyingine isiyo kuwa hiyo kama damu au mahali pa haja kubwa pakagusana na najisi nyingine kutoka nje haitatosheleza kuitwahirisha sehemu hiyo ispokuwa kwa kutumia maji, na lau kama atatia shaka ya kuwa imetwahirika sehemu hiyo au laa atajengea ya kuwa haikutwahirika na hapa atakuwa na hiayari kati ya kutumia maji mawe na mfano wa vitu viwili hivyo.