Śatapatha Brāhmaṇa ("of a hundred paths") 1.5.3.4

1.5.3.4

te vā ājyahaviṣo bhavanti | vajro vā ājyametena vai devā vajreṇājyenartūntsaṃvatsaram prājayannṛtubhyaḥ saṃvatsarātsapatnānantarāyaṃstatho evaiṣa etena vajreṇājyenartūntsaṃvatsaram prajayatyṛtubhyaḥ saṃvatsarātsapatnānantareti tasmādājyahaviṣo bhavanti

The sacrificial food at these offerings consists of clarified butter. Now the butter, indeed, is a thunderbolt, and with that thunderbolt, the butter, the gods gained the seasons, the year, and deprived their rivals of the seasons, of the year. And with that thunderbolt, the butter, he now, in the same way, gains the seasons, the year, and deprives his enemies of the seasons, of the year. For this reason clarified butter forms the sacrificial food at these (offerings).