Śatapatha Brāhmaṇa ("of a hundred paths") 2.5.4.7

2.5.4.7

atha yatpauṣṇaścarurbhavati | iyaṃ vai pṛthivī pūṣeyaṃ haivainam badhāya pratipradadāvanayā haivainam pratiprattaṃ jaghnustasmātpauṣṇaścarurbhavati

Then as to why there is a rice-pap for Pûshan. Pûshan doubtless is this earth, and this earth, indeed, gave him (Vritra) up to slaughter; and they slew him, thus given up by her: hence there is a rice-pap for Pûshan.