(72) باب النَّهْىِ عَنْ صِيَامِ الدَّهْرِ، وَذِكْرِ الاِخْتِلاَفِ، عَلَى مُطَرِّفِ بْنِ عَبْدِ اللَّهِ فِي الْخَبَرِ فِيهِ
It was narrated from Mutarrif bin 'Abdullah bin 'Abdullah bin Ash-Shikhkhir:
"My father told me that he heard the Messenger of Allah say, when mention was made in his presence of a man who fasted for the rest of his life: 'He neither fasted nor broke his fast."' '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."
Reference: Sunan an-Nasa'i 2380
In-book reference: Book 22, Hadith 291
English translation: Vol. 3, Book 22, Hadith 2382