CHĀNDOGYA UPANISHAD · 1.10.3

एतेषां मे देहीति होवाच ।
तान् अस्मै प्रददौ ।
हन्तानुपानम् इति ।
उच्छिष्टं वै मे पीतं स्याद् इति होवाच ॥

eteṣāṃ me dehīti hovāca ।
tān asmai pradadau ।
hantānupānam iti ।
ucchiṣṭaṃ vai me pītaṃ syād iti hovāca ॥

Ushasti said: 'Give me to eat of them.' He gave him the beans, and said: 'There is something to drink also! Then said Ushasti: 'If I drank of it, I should have drunk what was left by another, and is therefore unclean.'

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)