Aligned sentence by sentence
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Part One · Chapter Six — Ish and Ishah
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Ish and ishah are nouns laid down first for the man and the woman, then borrowed for every male and female of the other kinds of animal.
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It says, 'of every clean beast thou shalt take to thee seven and seven, the male and his mate' (Gen 7:2) — as if it had said, male and female.
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Then the noun ishah was borrowed for any thing prepared and made ready to be coupled with another thing. It says, 'the five curtains shall be joined together, one to another' (Exod 26:3).
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So it has become clear to you that aḥot ('sister') and aḥ ('brother') too are said equivocally, by way of borrowing, just like ish and ishah.