Arthashastra
प्रतिपन्नम् अभिसत्कृत्य आगतम् अवस्कन्देन प्रकाशयुद्धेन वा शत्रुणा घातयेत् ॥
[ The king] may kill [the enemy] who, having agreed and been honor ably received, arrives, through a sudden attack or in an open battle, in concert with [another] enemy.
english translation
pratipannam abhisatkRtya Agatam avaskandena prakAzayuddhena vA zatruNA ghAtayet ॥
hk transliteration by Sanscript