Bava Metzia 31: You Can Say That Again

When you've returned a lost animal, and the animal runs away again, and you find it again, you have to return it multiple times - as understood from the biblical verse. Plus, the fact that the person who finds answers returns the lost item or animals doesn't have to make his identity known. Plus, the doubling of verbs in many cases in the Torah, and how the sages relate to that compound verb.