Midrash for Ketubot 43:6
<big><strong>גמ׳</strong></big> א"ר אסי מנין להפה שאסר הוא הפה שהתיר מן התורה שנאמר (דברים כב, טז) את בתי נתתי לאיש הזה לאשה לאיש אסרה הזה התירה
Assi said: From where in the Torah is [the principle of] “the mouth that forbade is the mouth that permits”? Because it is said: “My daughter I gave to this man as a wife” (Deuteronomy 22:16): “To a man” he made her forbidden, “This,” he made her permitted.
Sifrei Devarim
"My daughter did I give to this man as a wife": We are hereby taught that the father has a right to betroth his daughter (who is) a minor.
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