Brihat Parashara Hora Shastra
शत्रुभे दुःखितः प्रोक्तो विकलः पापसंयुतः । खलः खलगृहे ज्ञेयः कोपी स्यादर्कसंयुतः ॥ ९॥
if a Grah is yuti with a malefic, it is in Vikal, if is in an enemy‟s Rāśi, it is in Duhkhit, if in a great enemy‟s Rāśi, it is in Khal and, if a Grah is being eclipsed by Sūrya, it is in Kop.
english translation
zatrubhe duHkhitaH prokto vikalaH pApasaMyutaH । khalaH khalagRhe jJeyaH kopI syAdarkasaMyutaH ॥ 9॥
hk transliteration by Sanscript