Shiva Purana
मामेव चिंतयेन्नित्यं परमात्मानमात्मनि॥ विशुद्धे निर्विकारे वै ब्रह्मसाक्षिणमव्ययम् ॥ ६५॥
He shall ponder and meditate in the pure Ātman without aberrations, upon me the great Ātman, the Sākṣin of Brahman, the unchanging.
english translation
mAmeva ciMtayennityaM paramAtmAnamAtmani॥ vizuddhe nirvikAre vai brahmasAkSiNamavyayam ॥ 65॥
hk transliteration by Sanscript