Mbh 12.362.2b

Causing all the worlds to blaze up with his glory and filling them with his energy, he came, as I have already told thee, towards Surya, rending the firmament, as it were, for making his path through it. The rays that emanated from his body seemed to resemble the blazing effulgence of libations of clarified butter poured into the sacrificial fire. In consequence of his energy and splendour he could not be looked at. His form seemed to be indescribable. Indeed, he appeared to us to be like a second Surya. As soon as he came near, Surya extended his two hands (for giving him a respectful reception). For honouring Surya in return, he also extended his right-hand. The latter then, piercing through the firmament, entered into Surya's disc. Mingling then with Surya's energy, he seemed to be transformed into Surya's self. When the two energies thus met together, we were so confounded that we could not any longer distinguish which was which. Indeed, we could not make out who was Surya whom we bore on his car, and who was the Being that we had seen coming through the sky. Filled with confusion, we then addressed Surya, saying,--"O illustrious one who is this Being that has mixed himself with thee and has been transformed into thy second self?"'"'"