Samavedabrahmananyashtau 178.8

Sāmavedabrāhmaṇānyaṣṭau 178.8

yaccaturviṃśo'gniṣṭomaścaturviṃśatyakṣarā gāyatrī
tejo brahmavarccasaṃ gāyatrī tejaeva brahmavarccasamavarundhai