Sunan an-Nasa'i 2374
سنن النسائي#2374SahihIt was narrated that 'Abdullah bin 'Umar said:"The Messenger of Allah said: 'Whoever fasts every day of is life, then he has neither fasted, nor broken the fast
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 22:285