When the Prophet’s son, Ibraaheem, died, neither the Prophet (pbuh) nor his companions took that month as a month of mourning and avoided marriage in it. Or when the Prophet’s beloved uncle, Hamzah, died and his liver was cut out and chewed on by Hind, that month was not taken as a month of mourning and marriage avoided in it. So, the practice of taking Muharram as a month of mourning and avoidance of marriage in it is clearly an INNOVATION in Islam. Dr Bilal