The Hajj ( pilgrimage ) is ( in ) the well-known ( lunar year ) months ( i.e. the 10th month , the 11th month and the first ten days of the 12th month of the Islamic calendar , i.e. two months and ten days ) . So whosoever intends to perform Hajj therein by assuming Ihram ) , then he should not have sexual relations ( with his wife ) , nor commit sin , nor dispute unjustly during the Hajj .