And it shall be, if you do not desire her, then you shall send her away for herself; you shall not sell her for money; you shall not treat her as a slave, because you have afflicted her.
English: “And you shall send her away” — this teaches that he sends her away with a get (bill of divorce).
On the daf / in context: Because she has become a full wife (“ve-hayesa lecha le-ishah”), her dismissal requires a formal get, just as any other Jewish wife. Ramban and Rambam discuss the practical details; Sifrei is explicit that a get is required.
Type of Learning
Derash on the verse (Sifrei) — “ve-shillachtah” implies a get.
What Is Learned
When the soldier no longer desires the former captive, he must release her with a formal get.