Chandogya Upanishad 3.9.3

3.9.3

sa ya etad evam amṛtaṃ veda marutām evaiko bhūtvā somenaiva mukhenaitad evāmṛtaṃ dṛṣṭvā tṛpyati \
sa etad eva rūpam abhisaṃviśati \
etasmād rūpād udeti \\309.3\

3. He who knows thus that nectar becomes one of the Maruts themselves and through Soma as his mouth is satisfied merely with seeing that nectar. He enters that very form and comes forth from that form.