Śatapatha Brāhmaṇa ("of a hundred paths") 4.6.7.12

4.6.7.12

athaitadvṛṣā somaḥ | yoṣā apo havirdhāne 'dhyeti tasmānmithunāccandramā jāto 'nnādvai tadannaṃ jātaṃ yadadbyaśca somācca candramāścandramā hyetasyānnaṃ ya eṣa tapati tadyajamānaṃ caivaitajjanayatyannādyaṃ cāsmai janayatyṛcaśca sāmnaśca yajamānaṃ janayatyadbhyaśca somāccāsmā annādyam

And there, in the Havirdhâna, that male, the Soma, longs after the female, the water. From that generation the moon was produced: from food, indeed, food is produced, viz. the moon from water and Soma; for the moon is the food of him that burns yonder. Hence he thereby produces the sacrificer, and for him he produces food: from the Rik and Sâman he produces the sacrificer, and from water and Soma he produces food for him.