Bhagavad-gītā As It Is · Text 13.2
The body, its knower and the field of knowledge
अर्जुन उवाच
प्रकृतिं पुरुषं चैव क्षेत्रं क्षेत्रज्ञमेव च ।
एतद्वेदितुमिच्छामि ज्ञानं ज्ञेयं च केशव ॥ १ ॥
श्रीभगवानुवाच
इदं शरीरं कौन्तेय क्षेत्रमित्यभिधीयते ।
एतद्यो वेत्ति तं प्राहु: क्षेत्रज्ञ इति तद्विद: ॥ २ ॥
arjuna uvāca
prakṛtiṁ puruṣaṁ caiva
kṣetraṁ kṣetra-jñam eva ca
etad veditum icchāmi
jñānaṁ jñeyaṁ ca keśava
śrī-bhagavān uvāca
idaṁ śarīraṁ kaunteya
kṣetram ity abhidhīyate
etad yo vetti taṁ prāhuḥ
kṣetra-jña iti tad-vidaḥ
Arjuna said: O my dear Kṛṣṇa, I wish to know about prakṛti [nature], puruṣa [the enjoyer], and the field and the knower of the field, and of knowledge and the object of knowledge. The Supreme Personality of Godhead said: This body, O son of Kuntī, is called the field, and one who knows this body is called the knower of the field.
Read Śrīla Prabhupāda's purport on Vedabase.io