Shiva Purana
एतत्ते कथितं कृष्ण याथात्म्यं परमात्मनोः ॥ रहस्यमपि योग्यो ऽसि भर्गभक्तो भवानिति ॥ ८१ ॥
O Kṛṣṇa, thus I have explained to you the innate nature of the great souls, Śiva and Śivā, though it is a secret because you are a qualified devotee of Śiva.
english translation
etatte kathitaM kRSNa yAthAtmyaM paramAtmanoH ॥ rahasyamapi yogyo 'si bhargabhakto bhavAniti ॥ 81 ॥
hk transliteration by Sanscript