Hudhaifa Revealed Aboo Moosa Al-Ash’ari Was One Of The Hypocrites..
We read in Siyar A'lam Al-Nubala Vol 2, pg. 393 - 394:
الأعمش ، عن شقيق ، قال : كنا مع حذيفة جلوساً ، فدخل عبد الله وأبو موسى المسجد فقال : أحدهما منافق ، ثم قال : إن أشبه النَّاسِ هَديا ودلاً وسمتاً برسول الله ﷺ عبد الله
رجاله ثقات : وأخرجه الفسوي في تاريخ
Narrated Al-A’mash from Shaqiq who said: We were sitting beside Hudhayfah and Abdullah (ibn Mas'ud) and Aboo Moosa (Al-Ash’ari) entered the mosque, Hudhaifa said: 'One of these two is a Munafiq', then he continue to say: 'The most similar people to the Prophet (saw) in his character, his actions and manner is Abdullah. (i.e. Aboo Musa is the Munafiq).
Footnote: the narrators of this narration are trustworthy, and this narration is narrated in Al-Ma’rifa wa Al-Tarikh of Al-Fasawi
Alkarbala