Bhagavad Gita 13.4

तत्क्षेत्रं यच्च यदृच्छ यद्विकारि यत्श्च यत् |
स च यो यत्प्रभावश्च तत्समासेन मे शृणु

Translation

Listen and I will explain to you what that field is and what its nature is. I will also explain how change takes place within it, from what it was created, who the knower of the field of activities is, and what his powers are.