Sankaracarya's Vivekachudamani 550

अहिर्निर्ल्वयनीं वायं मुक्त्वा देहं तु तिष्ठति ।

इतस्ततश्चाल्यमानो यत्किंचित्प्राणवायुना ॥

ahirnirlvayanīṃ vāyaṃ muktvā dehaṃ tu tiṣṭhati |

itastataścālyamāno yatkiṃcitprāṇavāyunā ||

(Sankaracarya's Vivekachudamani 550)

The body of the liberated person remains like the slough of the snake. Here and there, it is moved about by the force of Prana, the way it pleases.