Allah, exalted be His praise, says: "And when they are called to Allah and His Messenger to judge between them, at once a party of them turns away." [Surah al-Nur: 48]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / Q20485
Al-Hasan (may Allah have mercy on him) said that the Messenger of Allah (peace and blessings be upon him) said: "Whoever is summoned to one of the judges and does not respond, he is a wrongdoer."
This is mursal (the Successor narrates it directly from the Prophet).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20485