Arthashastra
प्रतिपन्नं "एतेषु सप्त रात्रम् एक एक मन्त्र बलि होमं स्वयं राज्ञा कर्तव्यम्" इति ब्रूयुः ॥
When the king agrees to the proposal he may be asked to perform in person special sacrifices and offerings with special mantras every night for seven days.
english translation
pratipannaM "eteSu sapta rAtram eka eka mantra bali homaM svayaM rAjJA kartavyam" iti brUyuH ॥
hk transliteration by Sanscript