Aitareya Upanishad 1.6

हृदयं निरभिद्यत हृदयान्मनो मनसश्चन्द्रमाः | नाभिर्निरभिद्यत नाभ्या अपानोऽपानान्मृत्युः | शिश्नं निरभिद्यत शिश्नाद्रेतो रेतस आपः ॥

hridayam nirabhidyata hridayan mano manasash chandramah | nabhir nirabhidyata nabhya apano'panan mrityuh | shishnam nirabhidyata shishnad reto retasa apah ||

The heart opened; from the heart, mind; from mind, the moon. The navel opened; from the navel, out-breath; from out-breath, death. The organ opened; from it, seed; from seed, the waters.

हृदय विदीर्ण हुआ; हृदय से मन, मन से चन्द्रमा। नाभि विदीर्ण हुई; नाभि से अपान, अपान से मृत्यु। शिश्न विदीर्ण हुआ; शिश्न से रेत, रेत से जल।