Bhagavad Gita Chapter 13.1 - 13.2
arjuna uvāca
prakṛtiḿ puruṣaḿ caiva
kṣetraḿ kṣetra-jñam eva ca
etad veditum icchāmi
jñānaḿ jñeyaḿ ca keśava
śrī-bhagavān uvāca
idaḿ śarīraḿ kaunteya
kṣetram ity abhidhīyate
etad yo vetti taḿ prāhuḥ
kṣetra-jña iti tad-vidaḥ
Translation
Arjuna said: O my dear Krishna, I wish to know about prakriti [nature], purusha [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 Kunti, is called the field, and one who knows this body is called the knower of the field.