Mundaka-3-1-3-yadā paśyaḥ

Sri Shankara’s Commentary (Bhashya) translated by S. Sitarama Sastri

Com.—Another mantra also conveys the same meaning at length. Yada, when; Pasyaha, one who sees, i.e., a learned man, i.e., a man of practice. Rukmavamam, of self-resplendent nature, or, of imperishable brightness as that of gold. ‘Creator,’ of all the universe; ‘Brahmayonim’ the Brahman who is the source of the manifested Brahman. When he sees the Brahman thus, then the learned man shaking off, or burning away good and bad deeds, forming a bondage to their root and being unaffected, i.e., freed from grief, attains that supreme equality which is identity with the Brahman. The equality in matters involving duality is certainly inferior to this.

Links
Various resources on the Mundakopanishad
Upanishad Series – Mundakopanishad Commentary by Swami Chinmayananda