The number of months in the sight of Allah is twelve (in a year) – so ordained by Him the day He created the heavens and the earth; of them four are sacred: that is the straight usage. So wrong not yourselves therein, and fight the Pagans all together as they fight you all together. But know that Allah is with those who restrain themselves.

Prophet sallallaahu alayhi wa sallam ( may Allah exalt his mention )said: “The best fasting after Ramadan is the fasting of Muharram and the best prayer after the obligatory prayer is the night voluntary prayer.” Muslim, Abu Daawood, An-Nasaa’i, Ibn Maajah and At-Tirmithi