ŚVETĀŚVATARA UPANISHAD · 5.10
नैव स्त्री न पुमान् एष न चैवायं नपुंसकः ।
यद् यच् छरीरम् आदत्ते तेन तेन स युज्यते ॥
naiva strī na pumān eṣa na caivāyaṃ napuṃsakaḥ ।
yad yac charīram ādatte tena tena sa yujyate ॥
It is not woman, it is not man, nor is it neuter; whatever body it takes, with that it is joined (only).
F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)