Brihat Parashara Hora Shastra
गुरुशुक्रौ विप्रवर्णौ कुजार्कौ क्षत्रियौ द्विज। शशिसोम्यौ वैश्यवर्णौ शनिः शूद्रो द्विजोत्तम्॥ २१॥
Castes of Grahas. Guru and Śukr are Brahmins. Sūrya is a royal Grah, while Candr and Budh belong to commercial community. Śani rules the Sudras (4th caste).
english translation
guruzukrau vipravarNau kujArkau kSatriyau dvija। zazisomyau vaizyavarNau zaniH zUdro dvijottam॥ 21॥
hk transliteration by Sanscript