Commentary for Kiddushin 38:13

ולר"מ תנאו קיים והתניא האומר לאשה הרי את מקודשת לי ע"מ שאין לך עלי שאר כסות ועונה ה"ז מקודשת ותנאו בטל דברי ר"מ רבי יהודה אומר בדבר שבממון תנאו קיים

hence we are informed otherwise.<span class="x" onmousemove="('comment',' Rashi: Since Scripture empowered him to designate her as a result of the purchase, it is as though he had said that he would subsequently designate her; therefore the cases are entirely analogous. Tosaf.: Since he did not explicitly state, 'from now,' the designation commences only later; hence she is betrothed to the second.');">¹³</span> Another [Baraitha] taught: If a man sells his daughter and stipulates,' on condition that he [her master] shall not designate [her],' the condition is binding:<span class="x" onmousemove="('comment',' Lit., 'fulfilled'.');">¹⁴</span>

Daf Shevui to Kiddushin