Shiva Purana
तदेतत्कथितं सर्वं कृष्णस्यामितकर्मणः ॥ महर्षेर्ज्ञानलाभश्च पुत्रलाभश्च शंकरात् ॥ २६ ॥
Thus I have narrated to you how Kṛṣṇa of wide activities attained knowledge from the great sage and a son from Śiva.
english translation
tadetatkathitaM sarvaM kRSNasyAmitakarmaNaH ॥ maharSerjJAnalAbhazca putralAbhazca zaMkarAt ॥ 26 ॥
hk transliteration by Sanscript