Chāndogya Upaniṣad 3.16.1

3.16.1

puruṣo vāva yajñaḥ \
tasya yāni caturviṃśativarṣāṇi tat prātaḥsavanam \
caturviṃśatyakṣarā gāyatrī \
gāyatraṃ prātaḥsavanam \
tad asya vasavo 'nvāyattāḥ \
prāṇā vāva vasavaḥ \
ete hīdaṃ sarvaṃ vāsayanti \\316.1\

1. Verily, a person is a sacrifice. His [first] twenty-four years are the morning Soma-libation, for the Gāyatrī meter has twenty-four syllables and the morning Soma-libation is offered with a Gāyatrī hymn. The Vasus are connected with this part of the sacrifice. Verily, the vital breaths (*prāṇa*) are the Vasus, for they cause everything here to continue ($\surd$*vas*).