Brihadaranyaka Upanishad 4.82

एतावदरे खल्वमृतत्वमिति होक्त्वा याज्ञवल्क्यो विजहार ॥

etaavad are khalv amritatvam iti hoktvaa yaajnavalkyo vijahaara

'This much indeed, my dear, is the teaching on immortality.' Having said this, Yajnavalkya departed (for the life of renunciation).

'मैत्रेयि! इतना ही तो अमृतत्व का उपदेश है।' ऐसा कहकर याज्ञवल्क्य (संन्यास हेतु) चले गए।