Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) was asked: After the obligatory prayers, which prayer is the most virtuous? The Noble Prophet (peace and blessings be upon him) said: The prayer performed in the middle of the night. He was asked: After the month of Ramadan, which fast is the most virtuous? The Noble Prophet (peace and blessings be upon him) said: The fast of Allah’s month which people call Muharram.
Hadith Referenceصحیح ابن حبان / كتاب الصلاة / 2563
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح