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