Surya Siddhanta
प्रकाशात्मा तमोहन्ता महान् इत्य् एष विश्रुतः। ऋचो +अस्य मण्डलम् सामान्युस्त्रामूर्तिर् यजूम्षि च॥
The sun is known as the natural illuminator, destroyer of darkness and the great one. His disc is the Ågveda, his ray is Sämveda and his form is Yajurveda.
english translation