Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.4.21

4.3.4.21

athaivamevopasadya | ātreyāya hiraṇyaṃ dadāti yatra vā adaḥ prātaranuvākamanvāhustaddha smaitatpurā śaṃsantyatrirvā ṛṣīṇāṃ hotāsāthaitatsado 'suratamasamabhipupruve ta ṛṣayo trimabruvannehi pratyaṅṅidaṃ tamo 'pajahīti sa etattamo 'pāhannayaṃ vai jyotirya idaṃ tamo 'pābadhīditi tasmā etajjyotirhiraṇyaṃ dakṣiṇāmanayajjyotirhi hiraṇyaṃ tadvai sa tattejasā vīryeṇarṣistamo 'pajaghānāthaiṣa etenaivaitajjyotiṣā tamo 'pahanti tasmādātreyāya hiraṇyaṃ dadhāti

Then, approaching in the same way, he gives some gold to an Âtreya. For, at the time when they recite the morning prayer, they were once upon a time singing praises here in front. Now Atri was the Hotri of the Rishis. Then the darkness of the Asuras came rushing into the Sadas. The Rishis said to Atri, 'Come back here, and dispel this darkness!' He dispelled that darkness; and thinking, 'He indeed is the light who has dispelled this darkness,' they brought him this light, gold, for a sacrificial gift,--for gold is indeed light; and by that same splendour and energy the Rishi dispelled the darkness. And so does he now also dispel the darkness by that light: therefore he bestows gold on an Âtreya.