Reference for Ketubot 135:14

והאי דקתני השיאה להודיעך כחן דרבנן דאע"ג דהשיאה וגלי דעתיה לא אזלינן בתר אומדנא

the reason the mishnah mentioned [the case where a father] gave her in marriage was to let you know the extent of the ruling of the sages [who hold] that although he had already given her in marriage and had thereby revealed the amount he wished to give, we do not follow such estimates.

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