[Avodah] Looking for sources about Chazal's Ruach Hakodesh

[Gershon Seif]

I'm searching for primary sources that tell us that Chazal had Ruach Hakodesh.

I believe the Steipler lists many nissim and techias hameisim episodes etc. throughout shas, but that is not what I'm looking for. A skeptic, such as one I'm currently discussing things with, can explain them away.

As for the Zohar that states: "And the Rabbanan of the Mishna and the Amoraim and all their Talmud they based on the secrets of the Torah."
(Zohar 3:152b) - Well a skeptic might reject the Zohar as a valid source.

Are there statements of chazal themselves about this, or perhaps Geonim or Rishonim?

I read about the Ritva RH 16B about Asmachta. I'm hoping for a long list of such sources.

Thanks!