Brihat Parashara Hora Shastra
रविणा संयुते केतौ कारकांशाद् व्ययस्थिते । शिवभक्तिर्भवेस्यत्त निर्विशंकं द्विजोत्तम ॥ ६८॥
If Sūrya and Ketu are in the 12th from Karakāńś, the native will worship Lord Shiva.
english translation
raviNA saMyute ketau kArakAMzAd vyayasthite । zivabhaktirbhavesyatta nirvizaMkaM dvijottama ॥ 68॥
hk transliteration by Sanscript