Śatapatha Brāhmaṇa ("of a hundred paths") 9.4.1.12

9.4.1.12

prajāpatirviśvakarmeti | prajāpatirvai viśvakamā sa hīdaṃ sarvamakaronmano gandharvastasya ṛkṣāmānyapsarasa iti mano ha gandharva ṛkṣāmairapsarobhirmithunena sahoccakrāmeṣṭayo nāmetyṛkṣāmāni vā eṣṭaya ṛkṣāmairhyāśāsata iti no 'stvitthaṃ no 'stviti sa na idam brahma kṣatram pātviti tasyokto bandhuḥ

'The lord of creatures, the all-worker,'--Pragâpati (lord of creatures) is indeed the all-worker, for he has wrought all this (universe);--'Manas (the mind) is the Gandharva: his Apsaras are the hymn-verses and hymn-tunes,'--as a Gandharva, the Mind indeed went forth, with the hymn-verses and hymn-tunes as the Apsaras, his mates;--'Wishes (eshti) by name,'--the hymn-verses and hymn-tunes are indeed wishes, for by verses and tunes people pray, 'May this accrue unto us! may it fare thus with us!'--'may he protect this our priest and nobility!' 'the meaning of this has been explained.