Sunan Ibn Majah 1716
سنن ابن ماجه#1716SahihIt was narrated from Abu Ayyub that the Messenger of Allah (ﷺ) said:“Whoever fasts Ramadan then follows it with six days of Shawwal, it is as if he fasted for a lifetime.”
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniHasan Sahih
Muhammad Fouad Abd al-BaqiHasan Sahih
Zubair Ali ZaiSahih Muslim
In-book reference: 7:79