KAṬHA UPANISHAD · 2.3.14

यदा सर्वे प्रमुच्यन्ते कामा येऽस्य हृदि श्रिताः ।
अथ मर्त्योऽमृतो भवत्यत्र ब्रह्म समश्नुते ॥ १४॥

yadā sarve pramucyante kāmā ye’sya hṛdi śritāḥ ।
atha martyo’mṛto bhavatyatra brahma samaśnute ॥ 14॥

When every desire that harboureth in the heart of a man hath been loosened from its moorings, then this mortal putteth on immortality; even here he enjoyeth Brahman in this human body.