Arthashastra
परस्य मुख्यान् मित्रत्वेन उपदिशन्तो दूत व्यञ्जनाः स्वामि सत्कारं ब्रूयुः, स्व पक्ष बल आधानं पर पक्ष प्रतिघातं च ॥
The conqueror‟s chief messengers, pretending to be friendly towards the enemy, should highly speak of the conqueror's respectful treatment of visitors, of the strength of his army, and of the likelihood of impending destruction of his enemy's men.
english translation
parasya mukhyAn mitratvena upadizanto dUta vyaJjanAH svAmi satkAraM brUyuH, sva pakSa bala AdhAnaM para pakSa pratighAtaM ca ॥
hk transliteration by Sanscript