Mahabharata 12.199.31

दिवाकरो गुणमुपलभ्य निर्गुणो; यथा भवेद्व्यपगतरश्मिमण्डलःतथा ह्यसौ मुनिरिह निर्विशेषवा;न्स निर्गुणं प्रविशति ब्रह्म चाव्ययम्

divākaro guṇamupalabhya nirguṇo; yathā bhavedvyapagataraśmimaṇḍalaḥtathā hyasau muniriha nirviśeṣavā;nsa nirguṇaṃ praviśati brahma cāvyayam

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