BṚHADĀRAṆYAKA UPANISHAD · 3.9.28

तान् हैतैः श्लोकैः पप्रच्छ --
यथा वृक्षो वनस्पतिस् तथैव पुरुषो ऽमृषा ।
तस्य लोमानि पर्णानि त्वग् अस्योत्पाटिका बहिः ॥

त्वच एवास्य रुधिरं प्रस्यन्दि त्वच उत्पटः ।
तस्मात् तद् आतृण्णात् प्रैति रसो वृक्षाद् इवाहतात् ॥

मांसान्य् अस्य शकराणि किनाटं स्नाव तत् स्थिरम् ।
अस्थीन्य् अन्तरतो दारुणि मज्जा मज्जोपमा कृता ॥

यद् वृक्षो वृक्णो रोहति मूलान् नवतरः पुनः ।
मर्त्यः स्विन् मृत्युना वृक्णः कस्मान् मूलात् प्ररोहति ॥

रेतस इति मा वोचत जीवतस् तत् प्रजायते ।
धानारुह इव वै वृक्षो ऽञ्जसा प्रेत्य सम्भवः ॥

यत् समूलम् आवृहेयुर् वृक्षं न पुनर् आभवेत् ।
मर्त्यः स्विन् मृत्युना वृक्णः कस्मान् मूलात् प्ररोहति ॥

जात एव न जायते को न्व् एनं जनयेत् पुनः ।
विज्ञानम् आनन्दं ब्रह्म रातिर् दातुः परायणम् ॥

जात एव न जायते को न्व् एनं जनयेत् पुनः ।
विज्ञानम् आनन्दं ब्रह्म रातिर् दातुः परायणम् ॥

तिष्ठमानस्य तद्विद इति ॥

tān haitaiḥ ślokaiḥ papraccha --
yathā vṛkṣo vanaspatis tathaiva puruṣo ’mṛṣā ।
tasya lomāni parṇāni tvag asyotpāṭikā bahiḥ ॥

tvaca evāsya rudhiraṃ prasyandi tvaca utpaṭaḥ ।
tasmāt tad ātṛṇṇāt praiti raso vṛkṣād ivāhatāt ॥

māṃsāny asya śakarāṇi kināṭaṃ snāva tat sthiram ।
asthīny antarato dāruṇi majjā majjopamā kṛtā ॥

yad vṛkṣo vṛkṇo rohati mūlān navataraḥ punaḥ ।
martyaḥ svin mṛtyunā vṛkṇaḥ kasmān mūlāt prarohati ॥

retasa iti mā vocata jīvatas tat prajāyate ।
dhānāruha iva vai vṛkṣo ’ñjasā pretya sambhavaḥ ॥

yat samūlam āvṛheyur vṛkṣaṃ na punar ābhavet ।
martyaḥ svin mṛtyunā vṛkṇaḥ kasmān mūlāt prarohati ॥

jāta eva na jāyate ko nv enaṃ janayet punaḥ ।
vijñānam ānandaṃ brahma rātir dātuḥ parāyaṇam ॥

jāta eva na jāyate ko nv enaṃ janayet punaḥ ।
vijñānam ānandaṃ brahma rātir dātuḥ parāyaṇam ॥

tiṣṭhamānasya tadvida iti ॥

Then Yâgñavalkya questioned them with these Slokas: 1. 'As a mighty tree in the forest, so in truth is man, his hairs are the leaves, his outer skin is the bark. 2. 'From his skin flows forth blood, sap from the skin (of the tree); and thus from the wounded man comes forth blood, as from a tree that is struck. 3. 'The lumps of his flesh are (in the tree) the layers of wood, the fibre is strong like the tendons. The bones are the (hard) wood within, the marrow is made like the marrow of the tree. 4. 'But, while the tree, when felled, grows up again more young from the root, from what root, tell me, does a mortal grow up, after he has been felled by death? 5. 'Do not say, "from seed," for seed is produced from the living; but a tree, springing from a grain, clearly rises again after death. 6. 'If a tree is pulled up with the root, it will not grow again; from what root then, tell me, does a mortal grow up, after he has been felled by death? 7. 'Once born, he is not born (again); for who should create him again?' 'Brahman, who is knowledge and bliss, he is the principle, both to him who gives gifts, and also to him who stands firm, and knows.'

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)