Kauṣītaki (Śāṅkhāyana) Brāhmaṇa 18.2.27

18.2.27

tac ca gāyatrī śatam jagatī śatam ca te dve bṛhatī śate /

and that one hundred Gāyatrīs and one hundred Jagatīs, they are two hundred Bṛhatīs;