Sankaracarya's Vivekachudamani 433

वर्तमानेऽपि देहेऽस्मिञ्छायावदनुवर्तिनि ।

अहन्ताममताभावो जीवन्मुक्तस्य लक्षणम् ॥

vartamāne'pi dehe'smiñchāyāvadanuvartini |

ahantāmamatābhāvo jīvanmuktasya lakṣaṇam ॥

(Sankaracarya's Vivekachudamani 433)

The absence of concepts of "I" and "mine" even in his body which persists like a shadow—this is the indication of a jivan-mukta.

“In material existence the living entity falsely claims things to be his. He thinks, “I am the monarch of all I survey.” This is ignorance. Actually, nothing belongs to him. Even the body and the senses do not belong to him, for they are given to him by the grace of the Lord to satisfy his different propensities through the material energy. Nothing actually belongs to the living entity, but he becomes mad after everything, claiming, “This is mine. This is mine. This is mine.” Janasya moho ’yam ahaṁ mameti [SB 5.5.8]. This is called illusion. Nothing belongs to the living entity, but he claims that everything belongs to him.