Bhagavad Gita 13.3

क्षेत्रज्ञं चापि मां विद्धि सर्वक्षेत्रेषु भारत |
क्षेत्रज्ञयोर्ज्ञानं यत्तज्ज्ञानं मतं मम

Translation

O scion of Bharat, I am also the knower of all the individual fields of activity. The understanding of the body as the field of activities, and the soul and God as the knowers of the field, this I hold to be true knowledge.