Śatapatha Brāhmaṇa ("of a hundred paths") 7.2.4.26

7.2.4.26

yā oṣadhīḥ pūrvā jātāḥ | devebhyastriyugam puretyṛtavo vai devāstebhya etāstrim purā jāyante vasantā prāvṛṣi śaradi manai nubabhrūṇāmahamiti somo vai babhruḥ saumyā oṣadhaya oṣadhaḥ puruṣaḥ śataṃ dhāmānīti yadidaṃ śatāyuḥ śatārghaḥ śatavīya etāni hāsya tāni śataṃ dhāmāni sapta ceti ya eveme sapta śīrṣanprāṇāstānetadāha

[He sows, with Vâg. S. XII, 75 seq.; Rik S. X, 97] 'The herbs first grown three ages before the gods,'--the gods doubtless are the seasons, and from them those (herbs) used to grow thrice, in spring, in the rainy season, and in the autumn;--'of the brown ones will I ponder,'--the brown one, doubtless, is Soma, and the herbs are related to Soma, and the Purusha (Pragâpati) is related to herbs;--'the hundred powers,'--inasmuch as he here lives a hundred (years), and has a hundred merits, and a hundred energies, there are in him those hundred powers;--'and seven,'--he thereby speaks of those seven vital airs in the head.