Four sacred months in Hijriah Calender

Abu Bakrah (may Allah be pleased with him) reported that the Prophet (peace and blessings of Allah be upon him) said: "The year is twelve months of which four are sacred, the three consecutive months of Dhu'l-Qa'dah, Dhu'l-Hijjah and Muharram, and Rajab Mudar which comes between Jumaada and Sha'baan."(Reported by al-Bukhari, 2958).