Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.4.33

4.3.4.33

tadāhuḥ | na devatāyā atidiśedidaṃ vai yāṃ devatāṃ saminddhe sā dīpyamānā śvaḥ-śvaḥ śreyasī bhavatīdaṃ vai yasminnagnāvabhyādadhati sa dīpyamāna eva śvaḥ-śvaḥ śreyānbhavati śvaḥ-śvo ha vai śreyānbhavati ya evaṃ vidvānpratigṛhṇāti tadyathā samiddhe juhuyādevametāṃ juhoti yāmadhīyate dadāti tasmādadhīyannātidiśet

Here they say,--Let him not assign it to any deity; for whatsoever deity he here kindles, that deity, being kindled, becomes ever more glorious from one day to the morrow; and to whatever fire he here adds fuel, that fire, being kindled, becomes ever more glorious from one day to the morrow; and ever more glorious does he become, whosoever, knowing this, accepts (a gift): even as one offers in kindled fire, so does he offer that (gift) which he gives to one learned in the scriptures. Therefore he who is learned in the scriptures need not assign (the gift to a deity).