Arthashastra
स राज्ञा पृष्ठः "तथा" इति ब्रूयात्, तच् च अभिज्ञानं दर्शयेत्, भूयो वा हिरण्यम् अन्तर् आधाय ॥
When he asks the ascetic (as to the veracity of the statement), the latter should acknowledge it, and produce a confirmatory evidence (by pulling out the bamboo stick).
english translation
sa rAjJA pRSThaH "tathA" iti brUyAt, tac ca abhijJAnaM darzayet, bhUyo vA hiraNyam antar AdhAya ॥
hk transliteration by Sanscript