Ancient Jews did not expect Messiah to declare himself: HELP!

I think it was about 6 months ago I found a reference either to the Talmud or ancient Jewish literature to the effect that some of the Rabbis taught that the Messiah was not to declare himself Messiah, but was to lead others to conclude this by his life.

I know later Judaism (Rambam/Maimonides) states this, but I need an older reference.

Anyone have that one handy?

I have looked through my notes, shuffled through books, hit it with a Spotlight search on the Mac, but no can find!

Help appreciated.

Thanks,

Ed