Ramayana
पञ्चवर्षसहस्राणि सूर्यं चैवान्ववर्तत । तस्थौ चोर्ध्वशिरोबाहुः स्वाध्यायधृतमानसः ॥ 7-10-8 ॥
For five thousand years he followed the course of the sun, and he stood with his head and arms uplifted, his mind fixed upon the study of the sacred scriptures.
english translation