Reference for Ketubot 204:4

והאלהים אמר רב אפילו בוגרת דאי לא תימא הכי אבי הבן מאי הנאה אתא לידיה אלא בההיא הנאה דקמיחתני אהדדי גמרי ומקני להדדי

But by God! Rav meant [his ruling to include] even one who is a bogeret. For should you not say this, what benefit does the son’s father derive? Rather by the benefit of joining the other family, they decisively transfer the money.

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