Hajjaj bin Muhammad al-Musaysi حجاج بن محمد المصيصي الأعور · The Book of Fasting

"The Messenger of Allah said: 'Whoever fasts every day of his life, then he has not fasted."'

"The Messenger of Allah said to me" and he quoted the same Hadith. '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."