Chandogya Upanishad 5.14.2

5.14.2

atsy annaṃ paśyasi priyam \
atty annaṃ paśyati priyaṃ bhavaty asya brahmavarcasaṃ kule ya etam evam ātmānaṃ vaiśvānaram upāste \
prāṇas tv eṣa ātmana iti hovāca \
prāṇas ta udakramiṣyad yan māṃ nāgamiṣya iti \\514.2\

'So you eat food and see what is dear. One who thus meditates upon this Vaiśvānara Ātman eats food and sees what is dear, and there is in his family the holy effulgence born of sacred wisdom. But this is only the Prāṇa of the Ātman. If you had not come to me your Prāṇa would have departed.'