Śatapatha Brāhmaṇa ("of a hundred paths") 3.3.4.6

3.3.4.6

atha somaparyāṇahanena paryāṇahyati | nedenaṃ nāṣṭrā rakṣāṃsi pramṛśāniti garbho vā eṣa bhavati tira iva vai garbhāstira ivaitatparyāṇaddhaṃ tira iva vai devā manuṣyebhyastira ivaitadyatparyāṇaddhaṃ tasmādvai paryāṇahyati

Thereupon he wraps (the Soma) up in the Soma-wrapper, lest the evil spirits should touch him. For this one doubtless is an embryo, and hidden (tiras), as it were, are embryos, and hidden also is that (which is) wrapped up;--hidden, as it were, are the gods to men, and hidden is that which is wrapped up: therefore he wraps him up.