Taittirīya Upaniṣad 3.10.5

3.10.5

sa ya evam̐vit /
asmāllokātpretya /
etamannamayamātmānamupasaṅkramya /
etaṃ prāṇamayamātmānamupasaṅkramya /
etaṃ manomayamātmānamupasaṅkramya /
etaṃ vijñānamayamātmānamupasaṅkramya /
etamānandamayamātmānamupasaṅkramya /
imāṇllokankāmānnī kāmarūpyanusañcaran /
etat sāma gāyannāste /
hā3vu hā3vu hā3vu // 5//

(5) He who knows this, on departing from this world, proceeding on to that self which consists of food, proceeding on to that self which consists of breath, proceeding on to that self which consists of mind, proceeding on to that self which consists of understanding, proceeding on to that self which consists of bliss, goes up and down these worlds, eating what he desires, assuming what form he desires. He sits singing this chant (_sāman_):—

Oh, wonderful! Oh, wonderful! Oh, wonderful! (6) I am food! I am food! I am food! I am a food-eater! I am a food-eater! I am a food-eater! I am a fame-maker (_śloka-kṛt_)! I am a fame-maker! I am a fame-maker! I am the first-born of the world-order (_ṛta_), Earlier than the gods, in the navel of immortality! Who gives me away, he indeed has aided me! I, who am food, eat the eater of food! I have overcome the whole world!