A man reported,

It was said to the Prophet ﷺ, "There is a man who fasts continuously."He replied, "I would prefer that he eat continuously."They said, "What about fasting two-thirds of the time?"He said, "Too much."They said, "Then half?"He said, "Too much."Then he said, "Shall I tell you what removes the rancor of the heart? Fasting three days of every month."

عن رجل من أصحاب النبي ﷺ قال

قيل للنبي ﷺ رجل يصوم الدهر. قال: وددت أنه يطعم الدهر. قالوا: فلثلثيه. قال: أكثر. قالوا: فنصفه. قال: أكثر. قال: ألا أخبركم بما يذهب وحر الصدر، صوم ثلاثة أيام من كل شهر.