The right of the adversary against whom you have a claim is that, if your claim against him is true, you maintain polite moderation in speaking to him and you do not deny his right. If your claim is false, you fear God, repent to Him, and abandon your claim.

وحق خصمك الذي تدعي عليه إن كنت محقا في دعواك أجملت مقاولته، و لم تجحد حقه وإن كنت مبطلا في دعواك اتقيت الله عزوجل وتبت إليه وتركت الدعوى