Abdullah bin Mas'ud (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to fast three days at the beginning of every month.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8439
With the same chain, it is narrated from Abdullah (may Allah be pleased with him) that he said: I never saw the Messenger of Allah (peace and blessings be upon him) not fasting on a Friday.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8440
Abu Hamzah al-Sukkari (may Allah have mercy on him) says that Asim bin Bahdalah narrated the hadith to him with the same meaning, and he said: Seldom did he miss fasting on Friday.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8441
Abd al-Malik bin Qatadah bin Milhan narrates from his father (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to command us to fast the white days: the 13th, 14th and 15th. And he said: "They are equal to (fasting) the whole year."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8442
Abd al-Malik bin al-Minhal narrates from his father, who was one of the Companions of the Prophet (peace and blessings be upon him), that he said: the Prophet (peace and blessings be upon him) used to command us to fast the three white days, and he would say: "They are the fasting of the whole year."
Al-Shaykh said: It has been narrated to us from Yahya bin Ma'in that he said: This is a mistake; it is actually Abd al-Malik bin Qatadah bin Milhan al-Qaysi.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8443
Sayyiduna Abu Dharr (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to command us "to fast the three white days (the 13th, 14th and 15th)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8444
Musa bin Talhah (may Allah have mercy on him) narrates: I heard Sayyiduna Abu Dharr (may Allah be pleased with him) at al-Rabadhah saying that the Messenger of Allah (peace and blessings be upon him) said: "O Abu Dharr, when you fast three days of the month, then (fast the 13th, 14th and 15th)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8445
Sayyidah Hafsah (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) used to fast three days of every month: Monday and Thursday, and Monday of the following week.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8446
Sayyidah Umm Salamah (may Allah be pleased with her) narrates that the Messenger of Allah (peace and blessings be upon him) used to command me "to fast three days of every month: Monday, Thursday and Thursday."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8447