Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "The best fasting after Ramadan is that of the sacred month of Allah, Muharram, and the best prayer after the obligatory prayers is the night prayer."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8421
Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "The best fasting after Ramadan is in the month of Allah that you call al-Muharram, and the best prayer after the obligatory prayer is the prayer in the middle of the night."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8422
It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was asked: "Which prayer is best after the obligatory prayer, and which fasting is best after the month of Ramadan?" He said: "The best prayer after the obligatory prayer is prayer in the depth of the night, and the best fasting after the month of Ramadan is fasting in Muharram."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8423
Jundub bin Sufyan al-Bajali (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) used to say: "Indeed, the best prayer after the obligatory prayers is prayer at night, and the best fasting after the month of Ramadan is in Allah's month which you call Muharram."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8424
Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Messenger of Allah (peace and blessings be upon him) used to fast until we would say he would not break his fast, and he would go without fasting until we would say that now he would not fast.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8425
Mujibah al-Bahiliyyah narrates from her father or her uncle (may Allah be pleased with him) that he came to the Messenger of Allah (peace and blessings be upon him), then he went away, and then he returned to him a year later. In one narration of Abu Musa: he came to him after a year, and his condition and appearance had changed. He said: "O Messenger of Allah, do you not recognise me?" He said: "Who are you?" He said: "I am the Bahili who came to you a year ago." He said: "What has changed you? You used to have a very fine appearance." He said: "Since I left you, I have not eaten any food except at night." So the Messenger of Allah (peace and blessings be upon him) said: "Why have you tormented yourself?" (Then he said:) "Fast the month of patience and one day of every month." He said: "Give me more, for I have the strength." He said: "Fast two days every month." He said: "Give me more, for I have more strength." So he said: "Then fast three days." Abd al-Wahid added that (he said:) "Of every month." He said: "Give me more, for I have strength." He said: "Fast in the sacred months and leave off; fast in the sacred months and leave off; fast in the sacred months and leave off." And he indicated three with his fingers, closing them and then releasing them.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8426