Incredible Wisdom of Bharat!

प्राप्ते शरीरभेदे चरितार्थत्वात्प्रधानविनिवृत्तौ। ऐकान्तिकमात्यन्तिकमुभयं कैवल्यमाप्नोति ॥६८॥

When time comes, it escapes from the body with a rupture as unmanifest material cause, the pradhana, withdraws itself. Having reached the goal that is both absolute and imperishable, it attains liberation.

How the purusha obtains final liberation, the kaivalya, is described here.

ॐ असतो मा सद्गमय। तमसो मा ज्योतिर्गमय। मृत्योर्माऽमृतं गमय। ॐ शान्ति: शान्ति: शान्ति: ॥ - बृहदारण्यकोपनिषद् 1.3.28
"Ōm! Lead me from the unreal to the real, from darkness to light, and from death to immortality. Let there be peace, peace, and peace. Ōm!" - Brihadaranyaka Upanishad 1.3.28

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