Musar על מכות 10:11

Commandment 196 prohibits sexual relations with one's daughter. This prohibition is not spelled out in the text because it is derived from the prohibition of sexual relations with one's granddaughter, a blood-relation more distant than one's daughter. Our sages have also derived this prohibition from the similarity in expressions used by the Torah (גזרה שוה). This is necessary because we have a rule that one may not punish someone for transgressing a prohibition which is derived merely by application of logic.