Ketubot 53A

חזייה דלא הוה ניחא ליה, אמר ליה: מאי דעתיך ⁠— משום דאמר ליה שמואל לרב יהודה: שיננא, לא תיהוי בעבורי אחסנתא אפילו מברא בישא לברא טבא ⁠— דלא ידיעא מאי זרעא נפיק מיניה, וכל שכן מברא לברתא,

Rav Pappa saw that Yehuda bar Mareimar was not amenable to the idea of entering the house. He said to him: What is on your mind? Do you not wish to enter due to that which Shmuel said to Rav Yehuda: Shinnana, do not be a partner in the transfer of an inheritance even from a bad son to a good son, as it is not known what seed will come from him? Perhaps the bad son will father worthy children. And all the more so, one should not be a partner in the transfer of an inheritance from a son to a daughter.

האי נמי תקנתא דרבנן היא, דאמר רבי יוחנן משום רבי שמעון בן יוחי: אמר ליה: הני מילי מדעתיה. לעשוייה נמי? אמר ליה: אטו מי קאמינא לך דעול ועשייה? עול ולא תעשייה קאמינא. אמר ליה: מעלאי דידי היינו עשייה.

Rav Pappa continued: Are you worried that your arrival will pressure Abba of Sura to give his daughter a more substantial dowry? But this too is an ordinance of the rabbis, that a father must provide a dowry for his daughter. This is as R' Yoḥanan said in the name of R' Shimon ben Yoḥai, as quoted above, that the rabbis enacted this matter so that a man should take the initiative and write an agreement to give his daughter a dowry as large as the portion of his possessions that his son will receive as an inheritance. Yehuda bar Mareimar said to him: This applies only if the man gives of his own free will, but should one force him as well? Rav Pappa said to him: Did I say to you that you should enter and force him? I merely said that you should enter, but do not force him. He said to him: My very entrance is an act that will effectively force him, as he will increase her dowry in my honor.