The works of Ādi Śaṅkarācārya

Chāndogyopaniṣadbhāṣyam

Verse 412

राणि पञ्च वर्षाण्युवास तान्येकशतँ सं-पेदुरेतत्तद्यदाहुरेकशतँ ह वै वर्षाणिमघवान्प्रजापतौ ब्रह्मचर्यमुवास तस्मैहोवाच ॥ ३ ॥

In plain words

He lived there for five years, which altogether came to one hundred and one. As the tradition tells us: Indra lived the life of a student under Prajāpati for one hundred and one years. And to him he spoke.

Close to the Sanskrit

Five years he dwelt; those amounted to one hundred and one. As they say indeed: One hundred and one years Maghavan lived the life of sacred study under Prajāpati. To him he said: 3.