Śatapatha Brāhmaṇa ("of a hundred paths") 10.2.4.3

10.2.4.3

sa yaḥ sa saṃvatsaro'sau sa ādityaḥ sa eṣa ekaśatavidhastasya raśmayaḥ śataṃ vidhā eṣa evaikaśatatamo ya eṣa tapatyasmintsarvasminpratiṣṭhitastathaivaitadyajamāna ekaśatadhātmānaṃ vidhāyāsmintsarvasminpratitiṣṭhati

Now this year is the same as yonder sun; and he is this one hundred and one-fold (Agni);--his rays are a hundredfold, and he himself who shines yonder, being the one hundred and first, is firmly established in this universe; and in like manner does the Sacrificer now establish himself in this universe by constructing for himself a body a hundred and one-fold.