Brihat Parashara Hora Shastra
षष्ठाऽष्टमव्ययस्थे च नीचास्तरिपुभस्थिते । अशुभं तत्फलं चाऽथ ब्रुवे सर्वदशाफलम् ॥ ६॥
The results are unfavourable, if the Dasha Lord is in Ari, Randhr, or Vyaya Bhava, in his debilitation, or in an inimical Rāśi.
english translation
SaSThA'STamavyayasthe ca nIcAstaripubhasthite । azubhaM tatphalaM cA'tha bruve sarvadazAphalam ॥ 6॥
hk transliteration by Sanscript