The Geographica is an ancient Greek Encyclopedia, thought to have been written around 2,000 years ago by Strabo.
An English language translation, The Geography of Strabo, was written by Horace Leonard Jones around 1917.
In Book XV, Chapter 1, Section 39 it states:
He says, then, that the population of India is divided into seven castes: the one first in honour, but the fewest in number, consists of the philosophers; and these philosophers are used, each individually, by the people making sacrifice to the gods or making offerings to the dead, but jointly by the kings at the Great Synod, as it is called, at which, at the beginning of the new year, the philosophers, one and all, come together at the gates of the king; and whatever each man has drawn up in writing or observed as useful with reference to the prosperity of either fruits or living beings or concerning the government, he brings forward in public; and he who is thrice found false is required by law to keep silence for life, whereas he who has proved correct is adjudged exempt from tribute and taxes.
Did any such punishment exist in the Mauryan Empire?
Please note that term 'philosophers' here may be incorrect because I have seen descriptions of these 7 castes in which the term 'philosophers' is not used.