Arthashastra
प्रतिपन्नं रात्रौ सत्त्रच् छन्नाः समागमे शस्त्र रसाभ्यां घातयेयुः ॥
and when he comes to meet with a woman at night as arranged, hidden spies may kill him with weapons or poison.
english translation
pratipannaM rAtrau sattrac channAH samAgame zastra rasAbhyAM ghAtayeyuH ॥
hk transliteration by Sanscript