श्री भगवानुवाचइदं शरीरं कौन्तेय क्षेत्रमित्यभिधीयते। एतद्यो वेत्ति तं प्राहुः क्षेत्रज्ञ इति तद्विदः॥
śrī bhagavānuvācaidaṃ śarīraṃ kaunteya kṣetramityabhidhīyate etadyo vetti taṃ prāhuḥ kṣetrajña iti tadvidaḥ
Meaning
Lord Shri Krishna replied: O Arjuna! The body of a person is the playground of the Self; and That which knows the activities of Matter, sages call the Self.
English translation by Shri Purohit Swami (1935), public domain. Sanskrit text in the public domain. About Duvidha