Arthashastra
तद् उभयं रसेन योजयित्वा प्रतिस्वादने ताव् एव उपयोजयेत् ॥
Having mixed those two things and half a cup of water with poison, he may substitute those things in the luncheon (of the king) outside the city.
english translation
tad ubhayaM rasena yojayitvA pratisvAdane tAv eva upayojayet ॥
hk transliteration by Sanscript