Śatapatha Brāhmaṇa ("of a hundred paths") 2.2.4.17

2.2.4.17

sa hovāca | agnaye 'gniranuṣṭhyā svaṃ retaḥ prajanayiṣyate tathā prajaniṣyadhva ityatha tubhyamiti sūryamatha yadeva hūyamānasya vyaśnute tadevaitasya yo 'yam pavata iti tadebhya idamapyetarhi tathaiva juhvatyagnaya eva sāyaṃ sūryāya prātaratha yadeva hūyamānasya vyaśnute tadevaitasya yo 'yam pavate

He replied, 'To Agni: Agni will forthwith cause his own seed to be reproduced, and so you will be reproduced.' 'Then to thee,' he said to Sûrya; 'and what of the offered (milk) he then is still possessed of, that shall belong to that blower (Vâyu)!' And, accordingly, they in the same way offer this (milk) to them till this day: in the evening to Agni, and in the morning to Sûrya; and what of the offered (milk) he then is still possessed of, that, indeed, belongs to that blower.