Shiva Purana
अग्रे ससर्ज वै ब्रह्मा मानसानात्मनः समान् ॥ सनन्दं सनकञ्चैव विद्वांसञ्च सनातनम् ॥ १९ ॥
In the past, Lord Brahmā created the mental form of the self. Sananda and Sanaka were the eternal learned men.
english translation
agre sasarja vai brahmA mAnasAnAtmanaH samAn ॥ sanandaM sanakaJcaiva vidvAMsaJca sanAtanam ॥ 19 ॥
hk transliteration by Sanscript