Hadith 4:579
Yazid ibn Harun narrated to us, he said: Imran ibn Hudayr informed us, from Abu Mijlaz, who said: I entered upon him while he was eating, and he said, "Draw near and eat." I said, "I am fasting." He said, "Perhaps you are one of those who claim to be fasting while they are not fasting." I said, "Subhan Allah!" He said, "There used to be those who were better than you who would fast three days of every month, then say, 'I am fasting.'"
حدثنا يزيد بن هارون قال أخبرنا عمران بن حدير عن أبي مجلز قال دخلت عليه وهو يأكل فقال ادن فكل قال قلت أني صائم قال فلعلك ممن يزعم أنه صائم وليس بصائم قلت سبحان الله قال قد كان من هو خير منك يصوم ثلاثة من كل شهر ثم يقول اني صائم