Chapter 13
Kshetra-Kshetragyavibhaagyoga

Idam shariiram kaunteya kshetram iti abhidhiiyate. Etat yah vetti tam praahuh kshetragya iti tadvidah. (Ch.13, shloka 1)
O Arjuna! This permanent chariot like body of yours itself is called the land of religion and actions by the name ‘field’ of the religious war of Mahabharat. The one who knows this extraordinary chariot of the end of the Iron [Age] + beginning of the Golden Age, he is called as ‘the Knower of the field’ like body by those learned sages and saints of the Copper [Age].