“Wrongdoing during the sacred months is more serious and more sinful that wrongdoing at any other time. Wrongdoing at any time is a serious matter, but Allaah gives more weight to whichever of His commands He wants….” (Tafseer Ibn Katheer; 9:36)
Ibn ‘Abbaas said in the tafseer for the above Ayah, that good deeds done during the four sacred months bring a greater reward. (Ibn Katheer)
RasoolAllaah (sallallaahu alayhi wasallam) said: ‘The best of fasting after Ramadaan is fasting Allaah’s month of Muharram.’” (Muslim).
Articles related to this month: http://www.islamicawakening.com/view…?articleID=983