Śatapatha Brāhmaṇa ("of a hundred paths") 10.2.4.6

10.2.4.6

yadvevaikaśatavidhaḥ saptavidhamabhisampadyata ekaśatadhā vā asāvādityo vihitaḥ saptākṣare brahmanpratiṣṭhitaḥ saptākṣaraṃ vai brahmargityekamakṣaraṃ yajuriti dve sāmeti dve atha yadato'nyadbrahmaiva taddvyakṣaraṃ vai brahma tadetatsarvaṃ saptākṣaram brahma tasminneṣa pratiṣṭhitastathaivaitadyajamāna ekaśatadhātmānaṃ vidhāya saptākṣare brahmanpratitiṣṭhati

And, again, as to how the one hundred and one-fold passes into the sevenfold one:--yonder sun, composed of a hundred and one parts, is established in the seven-syllabled Brahman, for the Brahman (holy writ or prayer) indeed consists of seven syllables,--'rik' is one syllable, 'yaguh' two, and 'sâma' two; and what other Brahman there is that is just the 'brahman' of two syllables--this seven-syllabled Brahman is the universe: therein that (sun) is established; and in like manner does the Sacrificer now establish himself in the seven-syllabled Brahman by constructing for himself a body one hundred and one-fold.