English: “You shall not see … and hide yourself” — from here [we learn] that if one saw it and then hid himself from it, he transgresses a negative commandment.
On the daf / in context: The verse is understood to create both a positive commandment (to return) and a negative commandment (not to ignore).
Type of Learning
Derash establishing a negative commandment alongside the positive one.
What Is Learned
Seeing a lost animal and deliberately ignoring it violates a negative commandment of the Torah.