Shiva Purana
पुरा रथन्तरे कल्पे वामदेवो महामुनिः ॥ गर्भमुक्तश्शिवज्ञानविदां गुरुतमस्स्वयम्॥ १०॥
In the past in the Kalpa between the chariots there lived a great sage named Vamadeva He himself was freed from the womb and was the most difficult of those who knew the knowledge of Lord Siva.
english translation
purA rathantare kalpe vAmadevo mahAmuniH ॥ garbhamuktazzivajJAnavidAM gurutamassvayam॥ 10॥
hk transliteration by Sanscript