Sayyiduna Bara’ bin Azib (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings be upon him):“If an imam, out of forgetfulness, leads people in prayer while in a state of major impurity (janabah), then the prayer of those people will be valid, but the imam should perform ghusl and repeat his own prayer. Similarly, if he (out of forgetfulness) leads the prayer without ablution (wudu), then the same ruling will apply.”The narrator named Isa bin Ibrahim has transmitted these very words.