Sunan Ibn Majah 1743
سنن ابن ماجه#1743Da'ifIt was narrated from Ibn ‘Abbas that:The Prophet (ﷺ) forbade fasting Rajab
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniVery Daif
Muhammad Fouad Abd al-BaqiVery Daif
Shuaib Al ArnautDaif
Zubair Ali ZaiDaif
In-book reference: 7:106