Śatapatha Brāhmaṇa ("of a hundred paths") 3.4.3.13

3.4.3.13

tadyadāpyāyayanti | devo vai somo divi hi somo vṛtro vai soma āsīttasyaitacarīraṃ yadgirayo yadaśmānastadeṣośānā nāmauṣadhirjāyata iti ha smāha śvetaketurauddālakistāmetadāhṛtyābhiṣuṇvanti tāṃ dīkṣopasadbhistānūnaptrairāpyāyanena somaṃ kurvantīti tatho evaināmeṣa etaddīkṣopasadbhistānūnaptrairāpyāyanena somaṃ karoti

Then as to why they strengthen (Soma). Soma is a god, since Soma (the moon) is in the sky. 'Soma, forsooth, was Vritra; his body is the same as the mountains and rocks: thereon grows that plant called Usânâ,'--so said Svetaketu Auddâlaki; 'they fetch it hither and press it; and by means of the consecration and the Upasads, by the Tânûnaptra and the strengthening they make it into Soma.' And in like manner does he now make it into Soma by means of the consecration and the Upasads, by the Tânûnaptra and the strengthening.