सैषा चतुष्पदा षड्विधा गायत्री तदेतदृचाभ्यनूक्तम् ॥ ३.१२.५ ॥
saiṣā catuṣpadā ṣaḍvidhā gāyatrī tadetadṛcābhyanūktam || 3.12.5 ||
5. The gāyatrī has four quarters, each being sixfold. This is what is stated in a Ṛk mantra:
Sā eṣā gāyatrī catuṣpadā, this gāyatrī has four feet [i.e., quarters]; ṣaṣvidhā, each of them sixfold; tat etat ṛcā abhyanūktam, this is what is stated in a Ṛk mantra [Ṛg Veda 10.10.3].
The gāyatrī is also known as Brahma-gāyatrī. It is one with everything.
The Upaniṣad says here that the gāyatrī has four quarters and each quarter has six parts (that is, it