Sunan Ibn Majah 1658
سنن ابن ماجه#1658Da'ifIt was narrated that Abu Hurairah said:"(The months in which) We fasted twenty-nine days at the time of the Messenger of Allah (ﷺ), were more than (the months in which) we fasted thirty days
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 ZaiDaif
In-book reference: 7:21