It was narrated from Abu Nawfal bin Abi 'Aqrab that his father said:
"I asked the Messenger of Allah about fasting and he said: 'Fast one day of the month.' I said: 'Fast one day of the month.' I said: 'O Messenger of Allah, let me do more, let me do more.' He said: 'Let me do more, let mo do more; I am able for it.' Then the Messenger of Allah fell silent until I thought that he was going to refuse my request. Then he said: 'fast three days of each month."'
Reference: Sunan an-Nasa'i 2433 In-book : Book 22, Hadith 344 English translation : Vol. 3, Book 22, Hadith 2435
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