The blessed Companion Hazrat Abu Huraira (Allah be pleased with him) reported that he (the Messenger of Allah – Allah bless him and grant him peace) was asked as to which prayer was most excellent after the prescribed prayer, and which fast was most excellent after the month of Ramadan. He said:
“The most excellent fast after Ramadan is God’s month. al-Muharram, and the most excellent prayer after what is prescribed is prayer during the night.”