Bhāṣya 8
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In plain words
From the Puruṣa arise the three forms of mantra. The Ṛcs have fixed syllable counts, metrical pādas, and endings, and use metres such as Gāyatrī. The Sāman is arranged in five or seven bhaktis—divisions—and is sung with stobhas, the inserted syllables, and other musical features. The Yajūṃṣi are prose formulas whose syllables, pādas, and endings are not fixed. From the Puruṣa also comes Dīkṣā, the performer’s consecration, marked by the muñja-grass girdle and other disciplines, as well as every yajña, beginning with Agnihotra.
Close to the Sanskrit
From that Puruṣa come the Ṛcs: mantras whose syllables, pādas, and endings are fixed and which are distinguished by metres such as Gāyatrī. The Sāman has five-bhakti and seven-bhakti divisions and is marked by singing with stobhas and the like. The Yajūṃṣi have no fixed syllable count, pādas, or endings and take the form of prose sentences. Thus there are three kinds of mantra. Dīkṣā, marked by the muñja girdle and the like, is a particular discipline imposed on the performer. And from him come all yajñas, beginning with Agnihotra.