Hadith 828:11
Wahb narrated to us, Shu'bah narrated to us, from Mu'awiyah ibn Qurrah, from his father, from the Prophet, peace and blessings of Allah be upon him, who said: "In the fasting of three days of the month is the fasting of a lifetime and its breaking."
حدثنا وهب، حدثنا شعبة، عن معاوية بن قرة، عن أبيه، عن النبي صلى الله عليه وسلم قال: " في صيام ثلاثة أيام من الشهر صوم الدهر وإفطاره "