Mukhtasar Muslim (Abridged) 610 — Virtue of fasting in Muharram

Narrated Abu Huraira (may Allah be pleased with him): The Messenger of Allah (peace and blessings of Allah be upon him) said: After the fasts of Ramadan, the most virtuous of all fasts are those of Muharram, which is the month of Allah, and after the obligatory prayers, the most virtuous prayer is the night (Tahajjud) prayer.