´It was narrated that 'Amr bin Shurahbil said:` "A man came to the Messenger of Allah and said: 'O Messenger of Allah, what do you say about a man who fated for the rest of his life?' The Messenger of Allah said: 'I wish that he would never eat for the rest of his life.' He said: 'Two-thirds ( of a lifetime)?' he said: 'That is too much.' He said: 'Half?' He said: 'Shall I not tell you of that which will take away impurity from the heart?' He said: 'Yes.' He said: 'Fasting for three days each month."' 'Ata said: "someone who heard him told me that Ibn 'Umar (said) that the Prophet said: 'Whoever fasts every day of his life, then he has not fasted."
Hadith Referenceسنن نسائي / كتاب الصيام / 2388
Hadith Gradingالألبانی:صحيح لغيره | زبیر علی زئی:حسن
Hadith Takhrij«انظر ما قبلہ (صحیح) (یہ روایت مرسل ہے، پچھلی روایت سے تقویت پاکر صحیح ہے)»
Explanation & Benefits
Hafiz Muhammad Ameen
“Corruptions of the heart.” Some scholars have taken this to mean, instead of corruptions, the restlessness of the heart; that is, if a person does not perform (righteous) worship, the heart remains restless. By fasting three days every month, the restlessness of the heart will be removed and tranquility will be attained.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 2388