The works of Ādi Śaṅkarācārya

Bṛhadāraṇyakopaniṣadbhāṣyam

Bhashya

Bhashya

छायायां बाह्ये तमसि अध्यात्मं च आवरणात्मकेऽज्ञानेहृदि च एका देवता, तस्या विशेषणम्- मृत्युः; फलं सर्वंपूर्ववत्, मृत्योरनागमनेन रोगादिपीडाभावो विशेषः ॥

In plain words

In the external shadow and darkness, as well as internally within veiling ignorance and in the heart, resides a single deity. Its defining characteristic is death. The reward is identical to what was stated before, with the specific distinction that freedom from diseases and other afflictions is attained through the absence of premature death.

Close to the Sanskrit

In shadow, in external darkness, and internally in veiling ignorance, and in the heart, there is one deity. Its attribute is death. The fruit is all as before; the particular is the absence of affliction by disease and the like through the non-arrival of death.