Shatapatha Brahmana 10.2.6.12

10.2.6.12

sa u eva yajustejāḥ yajurekaśatavidho yāni pañcāśatprathamāni yajūṃṣi yāni cottamāni tāḥ śataṃ vidhā atha yānyetadantareṇa yajūṃṣi kriyante saivaikaśatatamī vidhaivamu saptavidha ekaśatavidho bhavati sa yaḥ śatāyutāyāṃ kāmo ya ekaśatavidhe sapt!vidhena haiva tamevaṃvidāpnoti

And, having the Yagus for its light, it is a hundred and one-fold in respect of the Yagus (formulas),--the first fifty and the last fifty which are (used) make a hundred forms; and the Yagus which are used between them are the one hundred and first form. In this way also the sevenfold one becomes a hundred and one-fold, and whosoever knows this obtains even by the sevenfold one whatever wish there is both in a life of a hundred years and in the one hundred and one-fold (altar).