Brahma Sutras
ॐ उभयव्यपदेशात्तु अहिकुण्डलवत् ॐ ॥ ३-२-२७॥
But since both difference and non-difference are mentioned, the relationship (between the supreme Self and the individual is) as that between the snake and its coil.
english translation
OM ubhayavyapadezAttu ahikuNDalavat OM ॥ 3-2-27॥
hk transliteration by Sanscript