Śatapatha Brāhmaṇa ("of a hundred paths") 4.5.4.5

4.5.4.5

no ha vā idamagre sūrye bhrāja āsa | yadidamasminbhrājaḥ so 'kāmayatedam mayi bhrājaḥ syāditi sa etaṃ grahamapaśyattamagṛhṇīta tato 'sminnetadbhrāja āsaitāni ha vai tejāṃsyetāni vīryāṇyātmandhatte yasyaivaṃ viduṣa etāngrahān gṛhṇanti

And at first there was not in Sûrya that splendour which is now in him. He desired, 'May that splendour be in me!' He saw this graha and drew it for himself, and henceforth that splendour was in him. And verily for whomsoever, knowing this, they draw those cups of Soma, he takes unto himself those same fires (energies), those same powers.