Bṛhadāraṇyaka Upaniṣad ("Great Forest Teaching") 1.3.18

1.3.18

te devā abruvannetāvadvā idam̐ sarvaṃ yadannaṃ tadātmana āgāsīranu no'sminnanna ābhajasveti te vai mābhisaṃviśateti tatheti tam̐ samantaṃ pariṇyaviśanta | tasmādyadanenānnamatti tenaitāstṛpyantyevam̐ ha vā enam̐ svā abhisaṃviśanti bhartā svānām̐ śreṣṭhaḥ pura etā bhavatyannādo'dhipatirya evaṃ veda ya u haivaṃvidam̐ sveṣu prati pratirbubhūṣati na haivālaṃ bhāryebhyo bhavatyatha ya evaitamanubhavati yo vaitamanu bhāryānbubhūrṣati sa haivālaṃ bhāryebhyo bhavati

If a man knows this, then his own relations come to him in the same manner; he becomes their supporter, their chief leader, their strong ruler. And if ever anyone tries to oppose one who is possessed of such knowledge among his own relatives, then he will not be able to support his own belongings. But he who follows the man who is possessed of such knowledge, and who with his permission wishes to support those whom he has to support, he indeed will be able to support his own belongings.

Then breath (vital), by singing, obtained for himself eatable food. For whatever food is eaten, is eaten by breath alone, and in it breath rests.
The Devas said: 'Verily, thus far, whatever food there is, thou hast by singing acquired it for thyself. Now therefore give us a share in that food.' He said: 'You there, enter into me.' They said Yes, and entered all into him. Therefore whatever food is eaten by breath, by it the other senses are satisfied.