Hadith #6845 (Sahih al-Bukhari)
Book: Afflictions and the End of the World
Narrator(s): Abi Asha'sha
Grade: Sahih

Hudhaifa said, ‘In fact, it was hypocrisy that existed in the lifetime of the Prophet (ﷺ) but today it is Kufr (disbelief) after belief.’

Source: https://parallelquran.com/hadith/sahih-al-bukhari-6845/

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Hadith #1384 (Sahih Muslim)
Book: The Book of Mosques and Places of Prayer
Narrator(s): Abi Asha'sha
Grade: Sahih

While we were sitting with Abu Huraira in a mosque a man went out of the mosque after the call to prayer had been announced. (A man stood up in the mosque and set off.) Abu Huraira’s eyes followed him till he went out of the mosque. Upon this Abu Huraira said: This man has disobeyed Abu’l- Qasim (Muhammad) (ﷺ).

Source: https://parallelquran.com/hadith/sahih-muslim-1384/