What is the appropriate response to someone who accused me of possessing pornographic CDs without proof, and how should I deal with him if he asks for forgiveness and pardon?

He who accused you of evil has erred, and a severe warning has been issued against anyone who says about a believer that which is not in them. If what he said is not true of them, then he has slandered them, and that is a clear sin and a great calumny. We advise you not to respond to him, as that is more concealing for you and keeps people from talking about you, due to the virtue of ignoring the ignorant and pardoning the offender. If you are compelled to respond, you are permitted to belie him and complain to someone who will do you justice against him, but it is not permissible to respond to him with forbidden insults.