The works of Ādi Śaṅkarācārya

Muṇḍakopaniṣadbhāṣyam

Verse 5

सूर्यद्वारेण ते विरजा प्रयान्तियत्रामृतः स पुरुषो ह्यव्ययात्मा ॥ ११ ॥

In plain words

Cleansed of all stains, they pass through the solar gate to where the immortal Purusha dwells, whose essence never decays.

Close to the Sanskrit

Through the door of the sun they, stainless, journey forth, where that immortal person indeed is, of undecaying essence.