Shiva Purana
श्रीकृष्ण उवाच ॥ भगवान्मंत्रमाहात्म्यं भवता कथितं प्रभो ॥ तत्प्रयोगविधानं च साक्षाच्छ्रुतिसमं यथा ॥ १ ॥
Śrī Kṛṣṇa said:— My dear lord, you have explained the glories of this holy mantra. The method of using the Vedas is directly equal to that of the Vedas.
english translation
zrIkRSNa uvAca ॥ bhagavAnmaMtramAhAtmyaM bhavatA kathitaM prabho ॥ tatprayogavidhAnaM ca sAkSAcchrutisamaM yathA ॥ 1 ॥
hk transliteration by Sanscript