Brihat Parashara Hora Shastra
लग्नत्रये स्वभोच्चस्थे खेटे राजा भवेद् ध्रुवम् । यद्वा लग्ने दृकाणेंऽशे स्वोच्चखेटयुते द्विज ॥ १५॥
If the 3 Lagnas (natal, Hora and Ghatik) are occupied by Grahas in exaltation, or in own Rāśi, or, if the natal Lagn, the Dreshkan Lagn and the Navāńś Lagn have exalted Grahas, Raj Yog is formed.
english translation
lagnatraye svabhoccasthe kheTe rAjA bhaved dhruvam । yadvA lagne dRkANeM'ze svoccakheTayute dvija ॥ 15॥
hk transliteration by Sanscript