Sankaracarya's Vivekachudamani 440

देहेन्द्रियेष्वहंभाव इदंभावस्तदन्यके ।

यस्य नो भवतः क्वापि स जीवन्मुक्त इष्यते ॥

dehendriyeṣvahaṃbhāva idaṃbhāvastadanyake |

yasya no bhavataḥ kvāpi sa jīvanmukta iṣyate ||

(Sankaracarya's Vivekachudamani 440)

One who is free from the sense of "I" with regard to the body, sense-organs, etc., nor the concept of "this" with regard to other things, such a person is considered a jivan-mukta.