He was asked, "Which prayer is best after the obligatory prayers, and which fasting is best after the month of Ramadan?"He replied, "The best prayer after the obligatory prayer is the prayer in the depth of the night, and the best fasting after the month of Ramadan is fasting the month of Allah, Muharram."
سئل: أي الصلاة أفضل بعد المكتوبة؟ وأي الصيام أفضل بعد شهر رمضان؟ فقال: أفضل الصلاة بعد الصلاة المكتوبة، الصلاة في جوف الليل، وأفضل الصيام بعد شهر رمضان صيام شهر الله المحرم.
Muslim narrated it in the Book of Fasting (203/1163) from Zuhayr bin Harb, who said, "Jareer narrated to us, from Abdul-Malik bin Umayr, from Muhammad bin Muntashir, from Humayd bin Abdul-Rahman, from Abu Hurairah," and he related it.