Shiva Purana
द्वे अक्षरे ब्रह्मपरे त्वनंते समुदाहृते ॥ विद्याविद्ये समाख्याते निहिते यत्र गूढवत् ॥ ४२ ॥
The two Vidyā and Avidyā lie hidden in the imperishable, infinite great Brahman.
english translation
dve akSare brahmapare tvanaMte samudAhRte ॥ vidyAvidye samAkhyAte nihite yatra gUDhavat ॥ 42 ॥
hk transliteration by Sanscript