Arthashastra
तं राजा यम् अर्थं याचेत तम् अस्य करिष्यमाणः "सप्त रात्रम्" इति समानम् ॥
While engaged in performing some work at the request of the king, the latter may be requested to come and remain at the spot for seven nights . . . (as before).
english translation
taM rAjA yam arthaM yAceta tam asya kariSyamANaH "sapta rAtram" iti samAnam ॥
hk transliteration by Sanscript