Prashna Upanishad Verse 3.9

Sanskrit

तेजो ह वा उदानस्तस्मादुपशान्ततेजाः । पुनर्भवमिन्द्रियैर्मनसि सम्पध्यमानैः ॥ ९ ॥

Transliteration

tejo ha vā udānastasmādupaśāntatejāḥ | punarbhavamindriyairmanasi sampadhyamānaiḥ || 9 ||

S. Sitarama Sastri's Translation

The external fire tejas verily is udana. Therefore the fire being extinguished, one again enters another body with the senses clinging to the mind.

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Reference: Prashna Upanishad