Wa-itha duAAoo ila Allahi warasoolihi liyahkuma baynahum itha fareequn minhum muAAridoon (surah An Nur: 48)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(24:48) When they are called to Allah and His Messenger so that the Messenger may judge between them, *77 a party of them turns away.  *78

Wa izaa du`ooo ilal laahi wa Rasoolihee li yahkuma bainahum izaa fareequm minhum mu`ridoon

*77) These words clearly state that thejudgement of the Prophet is the judgement of Allah and the Command of the Prophet is the Command of Allah. Therefore, the invitation to obey the Prophet is an invitation to obey both Allah and His Prophet. (Also see An-Nisa: 59-61, and the E.N.'s thereof).
*78) This dces not only apply to the cases which came up before the Holy Prophet for a decision in his lifetime, but this continues valid even today. Thus, a summon from the court of a judge in an Islamic government, who judges a case in accordance with the Book of Allah and the Sunnah of His Prophet, is actually a summon from the Court of Allah and His Prophet and the one who repudiates the judge indeed repudiates both Allah and His Prophet. This thing has been explained in a tradition related by Hasan Basri thus: "Whosoever is summoned to appear before a judge from among the judges of the Muslims but fails to appear before him, he is a transgressor and forfeits his rights." (Al-Jassas, Ahkam-ul-Qur'an, Vol. III, p. 405). In other words, such a person not only renders himself punishable but also guilty and liable to be proceeded against.