(74) باب سَرْدِ الصِّيَامِ
It was narrated from 'Aishah that Hamzah bin 'Amr Al-Aslami asked the Messenger of Allah:
"O Messenger of Allah, I am a man who fasts continually: shoud I fast when traveling?" He said: "Fast if you wish and break you fast if you wish." 'Ata said: "someone who heard him told me that Ibn 'Umar (said) that the Prophet said: 'Whoever fasts every day of his life, and then he has not fasted."
Reference: Sunan an-Nasa'i 2384
In-book reference: Book 22, Hadith 295
English translation: Vol. 3, Book 22, Hadith 2386