B.G 13.05
ऋषिभिर्बहुधा गीतं छन्दोभिर्विविधैः पृथक्। ब्रह्मसूत्रपदैश्चैव हेतुमद्भिर्विनिश्चितम् ॥५॥
ṛṣibhirbahudhā gītaṃ chandobhirvividhaiḥ pṛthak. brahmasūtrapadaiścaiva hetumadbhirviniścitam ॥5॥
[ऋषिभिः (ṛṣibhiḥ) - by the sages; बहुधा (bahudhā) - in many ways; गीतं (gītaṃ) - sung; छन्दोभिः (chandobhiḥ) - by the Vedic hymns; विविधैः (vividhaiḥ) - various; पृथक् (pṛthak) - separately; ब्रह्मसूत्रपदैः (brahmasūtrapadaiḥ) - by the aphorisms of Brahman; च (ca) - and; एव (eva) - certainly; हेतुमद्भिः (hetumadbhiḥ) - with logic; विनिश्चितम् (viniścitam) - ascertained;]
The teachings have been sung in various ways by the sages, distinctly through the diverse Vedic hymns, and have been logically ascertained by the aphorisms of Brahman.
Gīta Bhāshya 13.05
The Brahma Sutras referred to here are concerning the nature of the body.
ब्रह्मसूत्राणि शारीरकम् ॥५॥
brahmasūtrāṇi śārīrakam ॥5॥
[ब्रह्मसूत्राणि (brahmasūtrāṇi) - Brahma Sutras; शारीरकम् (śārīrakam) - related to the body;]
The Brahma Sutras concerning the nature of the body.