Mahabharata 13.85.13

तमसस्तामसा भावा व्यापि सत्त्वं तथोभयम्सगुणस्तेजसो नित्यं तमस्याकाशमेव च

tamasastāmasā bhāvā vyāpi sattvaṃ tathobhayamsaguṇastejaso nityaṃ tamasyākāśameva ca

Our plain-language meaning of this verse is waiting for scholar review.