Bhagwad Gita
Chapter 13, Verse 2
श्री भगवानुवाचइदं शरीरं कौन्तेय क्षेत्रमित्यभिधीयते।एतद्यो वेत्ति तं प्राहुः क्षेत्रज्ञ इति तद्विदः।।13.2।।
The Blessed Lord said, "O Arjuna, this body is called the field; he who knows it is called the knower of the field by those who know them."