Ramayana
वेदा ब्राह्मणरूपेण गायत्री सर्वरक्षिणी । ओङ्कारो ऽथ वषट्कारः सर्वे राममनुव्रताः ॥ 7-109-8 ॥
The Vedas in the form of Brahmins, the Gayatri who protects all, the syllable Om, and the Vashat-call — all of these went, devoted to Rama.
english translation