Bhagavad-gītā As It Is · Text 13.5
The body, its knower and the field of knowledge
ऋषिभिर्बहुधा गीतं छन्दोभिर्विविधै: पृथक् ।
ब्रह्मसूत्रपदैश्चैव हेतुमद्भिर्विनिश्चितै: ॥ ५ ॥
ṛṣibhir bahudhā gītaṁ
chandobhir vividhaiḥ pṛthak
brahma-sūtra-padaiś caiva
hetumadbhir viniścitaiḥ
That knowledge of the field of activities and of the knower of activities is described by various sages in various Vedic writings. It is especially presented in Vedānta-sūtra with all reasoning as to cause and effect.
Read Śrīla Prabhupāda's purport on Vedabase.io