Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates from the Noble Prophet (peace and blessings be upon him) that he was asked: "Which prayer is the best after the obligatory prayers? And which fasts are the best after the fasts of Ramadan?" So the Prophet (peace and blessings be upon him) said: "The best prayer after the obligatory prayers is the prayer in the middle of the night (Tahajjud). And the best fasts after the fasts of Ramadan are the fasts of Allah’s month, Muharram."