Hadith 297:7
'Affan narrated to us, he said: Shu'bah narrated to us, from Mu'awiyah ibn Qurrah, from his father, from the Prophet, may Allah bless him and grant him peace, who said regarding fasting three days of the month: "It is the fasting of a lifetime and its breaking."
حدثنا عفان، قال: حدثنا شعبة، عن معاوية بن قرة، عن أبيه، عن النبي صلى الله عليه وسلم قال في صيام ثلاثة أيام من الشهر: " صوم الدهر وإفطاره "