Reference for Kiddushin 8:4

והלא דין הוא ומה אמה העבריה שאינה נקנית בביאה נקנית בכסף זו שנקנית בביאה אינו דין שתקנה בכסף

But does this not follow a minori: if a Hebrew maidservant, who cannot be acquired by intercourse, can be acquired by money; this one [a wife], who may be acquired [in marriage] by intercourse, can surely be acquired by money? Let a yebamah prove [the contrary:] she may be acquired by intercourse, yet she is not acquired by money.

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