Sayyiduna Hasan al-Basri (may Allah have mercy on him) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "Whoever is summoned to the court of a Muslim (judge) and does not go there, then that person will be considered a wrongdoer, and he will have no right."
Hadith Referenceسنن الدارقطني / كتاب فى الأقضية والأحكام وغير ذلك / 4492
Hadith Takhrij«أخرجه البيهقي فى((سننه الكبير)) برقم: 20548، والدارقطني فى ((سننه)) برقم: 4492، وأبو داود فى "المراسيل"، 391»