kṣetra-kṣetrajñavibhāgayoga - Verse śloka 4
śloka 4
tatkṣetraṃ yacca yādṛkca yadvikāri yataśca yat |
sa ca yo yatprabhāvaśca tatsamāsena me śṛṇu ||13-4||
Translation
Therefore, hear from Me in brief the field—what it is and of what nature, what modifications it has, and from what cause what effect arises—and also the knower of the field, what he is and of what power.