ऋषिभिर्बहुधा गीतं छन्दोभिर्विविधैः पृथक्।
13.5 It has been sung of in various ways by the Rsis, separately by the different kinds [The different branches of Vedic texts.] of Vedic texts, and also by the rational and convicing sentences themselves which are indicatvie of and lead of Brahman.
13.5 Sages have sung in many ways, in various distinctive chants and also in the suggestive words indicative of the Absolute, full of reasoning and decisive.
13.5. This has been sung many times by sages, and also has been clearly decided in the various Vedas in different contexts by means of [their] words that are suggestive of the Brahman (i.e. in the Upanisads) and are full of reasoning.
Rishibhirbahudhaa geetam cchandobhirvividhaih prithak; Brahmasootrapadaishchaiva hetumadbhirvinishchitaih.
ṛiṣhibhiḥ—by great sages; bahudhā—in manifold ways; gītam—sung; chhandobhiḥ—in Vedic hymns; vividhaiḥ—various; pṛithak—variously; brahma-sūtra—the Brahma Sūtra; padaiḥ—by the hymns; cha—and; eva—especially; hetu-madbhiḥ—with logic; viniśhchitaiḥ—conclusive evidence