The Mukhya Upaniṣads

Māṇḍūkya · Om and the Four Quarters of the Self

Mantra 6

एष सर्वेश्वर एष सर्वज्ञ एषोऽन्तर्याम्येष योनिः सर्वस्य प्रभवाप्ययौ हि भूतानाम् ॥ ६ ॥

In plain words

This is the Lord of all, the knower of all, the inner controller, the source of all; it is indeed the origin and dissolution of all beings.