Brihat Parashara Hora Shastra
ईशाच्युतसुरज्येष्ठा विष्णुकेशाः स्थिरे द्विभे। देवाः पंचदशावृत्त्या विज्ञेया द्विजसत्तम॥ ३२॥
in Immovable Rāśis Shiva, Vishnu and Brahma and in Common Rāśis Vishnu, Brahma and Shiva repeat 15 times the presidentship over these Akshavedāńśas.
english translation
IzAcyutasurajyeSThA viSNukezAH sthire dvibhe। devAH paMcadazAvRttyA vijJeyA dvijasattama॥ 32॥
hk transliteration by Sanscript