"After he (the father) has been faithless ("bagdah") to her" (by selling her,) by degrading her and not treating her as a Jewish daughter, he, too, is not permitted to retain her (i.e., to sell her a second time). These are the words of R. Yonathan b. Avtalmos. "bagdah" here connotes deceit" as in (Malachi 2:11) "bagdah Yehudah" and (Jeremiah 5:11) "for the house of Israel bagod bagdu against Me."
After He the Father Has Been Faithless Bagdah to Her
Mekhilta Tractate Nezikin 3:16