Reference for Ketubot 24:4
לא מבעיא קאמר לא מבעיא בת ישראל לישראל דלא מצי אמר לה עלויי קא מעלינן ליך אבל בת ישראל לכהן דמצי אמר לה עלויי קא מעלינן ליך אימא לא קמ"ל:
It is a case of “not only”; not only [is it allowed in the case of] the daughter of an Israelite [getting married] to an Israelite, who cannot say to her, “I am raising you up [to a higher social status”]; but [in the case of] the daughter of an Israelite [getting married] to a priest who can say to her, “I am raising you up [to a higher social status]” I might say that it is not allowed, therefore he teaches us that it is permitted.
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