As I discuss in this question, by far the most popular school of Hindu philosophy is the Vedanta school. But there are five other Astika or orthodox schools of Hindu philosophy: Purva Mimamsa, Samkhya, Yoga, Vaisheshika, and Nyaya. My question is about the Samkhya school, founded by the sage Kapila. In Adhyaya 1 Sutra 157 of the Samkhya Sutras, one of the defining texts of the Samkhya school, Kapila refutes the Advaita notion that there's only one Atma by noting that people have attained Moksha in the past and yet Samsara continues, implying that there must be more than one Atma:
Vamadeva, as well as others, has been released; (hence) Non-duality (is) not (a fact).
Here is how Aniruddha interprets this Sutra in his commentary on the Samkhya Sutras:
The author declares that, for the following reason also, the Selves are many. In the Puranas, etc., it is heard, "Vamadeva has been released," "Shuka has been released," etc. If the Self were one and one only, since on the release of one, there would be the release of all, the mention of diversity (as in the case of separate and successive releases) would be contradicted.
I'm interested in the part in bold. Vyasa's son Shuka attaining Moksha is described in this chapter of the Shanti Parva of the Mahabharata (although there's some contretemps regarding that). But my question is, what scriptures describe the sage Vamadeva attaining Moksha?
Now as I discuss here, the Aitareya and Brihadaranyaka Upanishads discuss Vamadeva attaining Jnana. And one who has attained Jnana is considered a Jivanmukta according to Advaitins. But the Samkhya school didn't accept the notion of Jivanmuktas, so I assume there must be some scripture which describes Vamadeva actually dying and attaining Moksha.