Jñāneśvarī (commentary on the Bhagavadgītā) 13.8

13.8

kṣetrajñaṃ cāpi māṃ viddhi sarvakṣetreṣu bhārata
kṣetrakṣetrajñayor jñānaṃ yat taj jñānaṃ mataṃ mama
tari kṣetrajñu jo etheṃ |
to mī jāṇa niruteṃ |
jo sarva kṣetrāteṃ |
saṃgoponi ase ||

Then know for certain that the knower of the field here / is Myself, / who preserves and sustains / all the fields.